1) Global warming is caused by human emissions of greenhouse gases like carbon dioxide that trap heat in the atmosphere. The thin layer of atmosphere where climate occurs could be impacted by human activity.
2) Carbon dioxide levels have increased 30% due to human emissions from fossil fuel combustion and are correlated with rising global temperatures. If emissions continue unchecked, CO2 levels not seen in over 50 million years will result.
3) Impacts of climate change are already occurring, including rising seas, worsening extreme weather, melting glaciers and ice sheets, and damage to ecosystems. More severe consequences are projected if emissions are not reduced substantially.
This document provides an overview of global warming and climate change. It discusses what global warming is, evidence that it is caused by human activity like burning fossil fuels, the greenhouse gases involved like carbon dioxide, how atmospheric CO2 concentrations have increased, temperature changes observed in recent decades and centuries, and the impacts of climate change like rising sea levels and more extreme weather. It also covers the scientific consensus on climate change through organizations like the IPCC, potential issues with approaches to reduce emissions like carbon sequestration, and the need to transition to renewable energy sources.
This document provides an overview of global warming and greenhouse gases. It discusses that global warming is caused by human emissions of greenhouse gases like carbon dioxide. While carbon dioxide levels have increased about 30% due to human activity, additional increases are projected under business as usual conditions. The document also summarizes potential impacts of climate change like rising sea levels and increased extreme weather events. It notes that most scientists and organizations like the IPCC agree that climate change poses a serious risk. However, some proposals to continue fossil fuel use through carbon capture and storage technologies may not be effective and could delay transition to renewables.
Earth's climate is mostly influenced by the first 6 miles or so of the atmosphere which contains most of the matter making up the atmosphere. This is really a very thin layer if you think about it. In the book The End of Nature, author Bill McKibbin tells of walking three miles to from his cabin in the Adirondack's to buy food. Afterwards, he realized that on this short journey he had traveled a distance equal to that of the layer of the atmosphere where almost all the action of our climate is contained. In fact, if you were to view Earth from space, the principle part of the atmosphere would only be about as thick as the skin on an onion! Realizing this makes it more plausible to suppose that human beings can change the climate. A look at the amount of greenhouse gases we are spewing into the atmosphere (see below), makes it even more plausible
Global warming is caused by increased levels of greenhouse gases like carbon dioxide trapping heat in the atmosphere. The vast majority of scientists agree that human activity, like burning fossil fuels, is the dominant cause of rising CO2 levels and global temperatures in recent decades. While technologies to capture and store carbon emissions are being investigated, there are concerns these methods may fail or have unintended environmental consequences if relied on heavily instead of transitioning to renewable energy sources.
1) Global warming is caused by increased levels of greenhouse gases like carbon dioxide trapping heat in the lower atmosphere. The thin layer of atmosphere where climate occurs can be influenced by human activity.
2) Human activities like burning fossil fuels have increased atmospheric CO2 levels by about 30% since the industrial revolution, contributing to observed rising global temperatures according to computer models.
3) Potential impacts of unmitigated climate change include rising sea levels, worsening extreme weather, melting ice caps and glaciers, and damage to ecosystems. Reducing emissions from coal power plants, increasing renewable energy and energy efficiency can help address the problem.
Global warming is caused primarily by human-induced increases in greenhouse gas emissions such as carbon dioxide and methane. The average global surface temperature has increased around 1°C over the past century and is projected to rise another 1-6°C by 2100 according to climate models. This warming will cause sea level rise and changes in weather patterns through feedback loops like increased water vapor and reduced ice and snow cover. There is an ongoing public debate around climate change and potential policy responses like emissions reductions and adaptation measures.
Global warming is a slow rise in Earth's surface temperature caused by increased levels of carbon dioxide and other greenhouse gases from human activities like burning fossil fuels. Temperatures have increased about 0.74°C in the last 150 years and are projected to rise up to 6°C in the next century. Higher temperatures cause sea level rise from water expansion and melting ice sheets and glaciers, threatening many coastal cities. While some effects of global warming are uncertain, consequences may include stronger storms, shifting climate patterns, and damage to agriculture and natural environments. Responses have included international agreements like the Kyoto Protocol to reduce greenhouse gas emissions and efforts to adapt to or mitigate climate change impacts.
Human activities are the dominant cause of modern global warming through increasing greenhouse gases in the atmosphere. Burning fossil fuels has raised atmospheric carbon dioxide levels 35% since the industrial revolution. Other important greenhouse gases include methane and nitrous oxide from agriculture and industrial activities. Multiple independent scientific studies conclude there is over a 90% probability that human emissions have warmed the planet in recent decades, and natural factors alone cannot explain the observed temperature rise.
This document provides an overview of global warming and climate change. It discusses what global warming is, evidence that it is caused by human activity like burning fossil fuels, the greenhouse gases involved like carbon dioxide, how atmospheric CO2 concentrations have increased, temperature changes observed in recent decades and centuries, and the impacts of climate change like rising sea levels and more extreme weather. It also covers the scientific consensus on climate change through organizations like the IPCC, potential issues with approaches to reduce emissions like carbon sequestration, and the need to transition to renewable energy sources.
This document provides an overview of global warming and greenhouse gases. It discusses that global warming is caused by human emissions of greenhouse gases like carbon dioxide. While carbon dioxide levels have increased about 30% due to human activity, additional increases are projected under business as usual conditions. The document also summarizes potential impacts of climate change like rising sea levels and increased extreme weather events. It notes that most scientists and organizations like the IPCC agree that climate change poses a serious risk. However, some proposals to continue fossil fuel use through carbon capture and storage technologies may not be effective and could delay transition to renewables.
Earth's climate is mostly influenced by the first 6 miles or so of the atmosphere which contains most of the matter making up the atmosphere. This is really a very thin layer if you think about it. In the book The End of Nature, author Bill McKibbin tells of walking three miles to from his cabin in the Adirondack's to buy food. Afterwards, he realized that on this short journey he had traveled a distance equal to that of the layer of the atmosphere where almost all the action of our climate is contained. In fact, if you were to view Earth from space, the principle part of the atmosphere would only be about as thick as the skin on an onion! Realizing this makes it more plausible to suppose that human beings can change the climate. A look at the amount of greenhouse gases we are spewing into the atmosphere (see below), makes it even more plausible
Global warming is caused by increased levels of greenhouse gases like carbon dioxide trapping heat in the atmosphere. The vast majority of scientists agree that human activity, like burning fossil fuels, is the dominant cause of rising CO2 levels and global temperatures in recent decades. While technologies to capture and store carbon emissions are being investigated, there are concerns these methods may fail or have unintended environmental consequences if relied on heavily instead of transitioning to renewable energy sources.
1) Global warming is caused by increased levels of greenhouse gases like carbon dioxide trapping heat in the lower atmosphere. The thin layer of atmosphere where climate occurs can be influenced by human activity.
2) Human activities like burning fossil fuels have increased atmospheric CO2 levels by about 30% since the industrial revolution, contributing to observed rising global temperatures according to computer models.
3) Potential impacts of unmitigated climate change include rising sea levels, worsening extreme weather, melting ice caps and glaciers, and damage to ecosystems. Reducing emissions from coal power plants, increasing renewable energy and energy efficiency can help address the problem.
Global warming is caused primarily by human-induced increases in greenhouse gas emissions such as carbon dioxide and methane. The average global surface temperature has increased around 1°C over the past century and is projected to rise another 1-6°C by 2100 according to climate models. This warming will cause sea level rise and changes in weather patterns through feedback loops like increased water vapor and reduced ice and snow cover. There is an ongoing public debate around climate change and potential policy responses like emissions reductions and adaptation measures.
Global warming is a slow rise in Earth's surface temperature caused by increased levels of carbon dioxide and other greenhouse gases from human activities like burning fossil fuels. Temperatures have increased about 0.74°C in the last 150 years and are projected to rise up to 6°C in the next century. Higher temperatures cause sea level rise from water expansion and melting ice sheets and glaciers, threatening many coastal cities. While some effects of global warming are uncertain, consequences may include stronger storms, shifting climate patterns, and damage to agriculture and natural environments. Responses have included international agreements like the Kyoto Protocol to reduce greenhouse gas emissions and efforts to adapt to or mitigate climate change impacts.
Human activities are the dominant cause of modern global warming through increasing greenhouse gases in the atmosphere. Burning fossil fuels has raised atmospheric carbon dioxide levels 35% since the industrial revolution. Other important greenhouse gases include methane and nitrous oxide from agriculture and industrial activities. Multiple independent scientific studies conclude there is over a 90% probability that human emissions have warmed the planet in recent decades, and natural factors alone cannot explain the observed temperature rise.
Global warming is caused primarily by human-induced increases in greenhouse gases from burning fossil fuels and deforestation. The planet's average surface temperature has risen about 1°C since 1900, with about two-thirds of the increase occurring since 1980. If emissions continue at a high rate, global temperatures could increase by 2.4-6.4°C by 2100. Impacts are already apparent and include sea level rise, extreme weather events, and species extinction. Mitigating emissions through policy changes aims to limit further warming to under 2°C.
Global Warming , Greenhouse Gases and ClimateSD Paul
The document discusses evidence that the Earth's surface temperature has increased about 1 degree Fahrenheit over the past century, with accelerated warming in recent decades. This warming is largely attributable to increased greenhouse gas emissions from human activities. However, some uncertainties remain about how the climate responds to these gases. The document also notes there is debate around how much human activities versus natural variations are contributing to increased temperatures. Skeptics argue the data does not clearly show man-made warming or that temperatures have in some cases cooled in recent decades.
The document discusses the history of how global climate change became framed as an issue. It traces ideas from the 1820s about the greenhouse effect to modern events like the Kyoto Protocol and Paris Agreement. Key developments included establishing the Keeling Curve in 1958, Hansen's 1988 congressional testimony, and formation of the IPCC in 1989. Climate change became increasingly politicized over debates around economic costs, conservative ideology, and uncertainty about impacts. Different groups have framed the issue through these lenses to influence public views on climate policy.
Global warming is the increase of Earth's average surface temperature due to greenhouse gases like carbon dioxide trapping heat that would otherwise escape. Earth's climate is influenced by the thin atmosphere layer containing most air. While thin, human emissions make it plausible we can impact climate. Significant greenhouse gases include water vapor and carbon dioxide, which has internal vibrational modes that absorb and re-emit infrared radiation. Carbon dioxide remains in the atmosphere for hundreds of years, acting as a controlling factor rather than reacting one. Human emissions have increased atmospheric carbon dioxide by 30% correlating with fossil fuel use, with future projections showing levels not seen in 50 million years posing serious negative effects.
This document discusses various natural and human factors that can influence climate change. It describes several natural processes such as volcanic eruptions, ocean circulation patterns, solar activity, and Earth's orbital and rotational changes that have short or long-term effects on climate. It also explains how human activities like burning fossil fuels and deforestation have increased greenhouse gases in the atmosphere and led to issues like global warming and ocean acidification. The document provides examples and diagrams to illustrate these concepts and their impacts on climate.
This presentation on climate change was given by Kate Lonsdale.
Kate Lonsdale from the NCVO climate change and BME Communities Project gave this in Manchester on the 1st May 2012.
Find out more about NCVO events: http://www.ncvo.org.uk/training-and-events/events-listing
The document discusses several topics related to global warming:
1. It argues that there is no single "normal" earth temperature and that temperatures have varied significantly over long periods in earth's history, with many periods being warmer than today.
2. It claims the earth has been cooling since 1998 according to satellite data, in contrast to IPCC predictions of steady warming.
3. It asserts there is no scientific consensus on anthropogenic global warming and cites several petitions and analyses that refute the claimed consensus.
4. It argues that CO2 is not a pollutant but rather a naturally occurring gas essential for life, and that levels have been much higher for most of earth's history without negative effects.
Global warming is caused by the greenhouse effect from increased CO2 and other gases trapping heat in the atmosphere. The majority of scientists agree that human activity, such as burning fossil fuels, is the main driver of increased greenhouse gas levels and global temperature rises in recent decades. If emissions continue at their current rate, average global temperatures could increase 4-5°C by 2100, causing sea level rises and more extreme weather. Major changes are needed to transition to renewable energy and reduce CO2 emissions to prevent catastrophic climate change impacts.
The document discusses human-caused global warming and how it can be slowed and stopped through practical actions. While some predictions of global warming effects are exaggerated, the evidence is clear that warming is occurring due to increased greenhouse gases from human activities. Studying factors like glacial melting and climate forcing agents shows that global warming can be addressed by reducing emissions to achieve a healthier atmosphere.
1) The document discusses evidence that human activities like burning fossil fuels and deforestation have increased greenhouse gas levels since the Industrial Revolution and are the main cause of recent global warming.
2) Natural factors alone like variations in solar activity or volcanic eruptions cannot explain the rapid warming seen in recent decades.
3) Some evidence suggests that early human agriculture as far back as 8,000 years ago may have warmed the planet enough to delay the onset of the next ice age.
This document discusses global climate change and its various aspects. It provides an overview of the history and science of global warming, summarizing that increasing greenhouse gas emissions are causing the planet to warm due to human activities. Main greenhouse gases like carbon dioxide, methane, and nitrous oxide are explained in terms of their sources and impacts. The effects of global warming are expected to include continued temperature rise, more extreme weather, sea level rise, and effects on ecosystems. International agreements to address climate change like the UNFCCC and Kyoto Protocol are also summarized.
Global Warming Of The 21st Century Slide Showlenci678
Global warming is a controversial issue with uncertain causes according to the document. While the IPCC argues that human carbon dioxide emissions are the main driver of recent warming, the document notes there are other potential natural causes like the sun, extraterrestrial dust, and changes in cloud cover. The document reviews the evidence for both human and natural causes of climate change and periods of past warming and cooling like the Roman Warming, Dark Ages, Medieval Warming and Little Ice Age. It concludes that climate has varied naturally over millions of years and scientists are still uncertain if current warming is predominantly human-caused or part of this natural variability.
This document discusses greenhouse gases and the greenhouse effect. It describes the major greenhouse gases in Earth's atmosphere, including water vapor, carbon dioxide, methane and nitrous oxide. It explains that while greenhouse gases occur naturally, human activities like burning fossil fuels have substantially increased their levels since the Industrial Revolution. The document also outlines the role of greenhouse gases and water vapor in the greenhouse effect, sources of anthropogenic emissions, how long gases remain in the atmosphere, their global warming potential, and some related effects.
This work is done for students in the promotion of our College Seminar Lady of the Valley, and of course by our English teacher, Jimmy H. profesror Vergara. If I remember, my name Juank.
This document discusses whether climate change is natural or man-made. It first defines climate change as a change directly or indirectly caused by human activity that alters the atmosphere's composition beyond natural variability. It then outlines opinions on the issue and parameters to measure climate change such as temperature, precipitation, sea level, solar activity, volcanic activity, and chemical composition. While some argue multiple factors can cause climate change, data on temperature, precipitation, sea level, and chemical composition suggest human activity is the dominant cause of current climate change. The document concludes natural cycles only have a small effect and recommendations are provided for mitigating climate change.
Global warming is the rise in average global temperatures due to increased greenhouse gas emissions from human activities like burning fossil fuels. Climate models project further global temperature increases between 1.1 to 6.4°C by 2100 depending on emissions levels. Effects of warming include sea level rise, more extreme weather, and species extinction. Most countries have adopted policies through the UNFCCC to reduce emissions and adapt to climate change, with a goal of limiting warming to below 2°C.
IPCC from AR5 to AR6 - WGI Perspectives - by Panmao Zhai, Co-Chair of WGIipcc-media
This document summarizes the key changes from the IPCC Fifth Assessment Report (AR5) to the upcoming Sixth Assessment Report (AR6) on climate change. It notes that AR5 had 14 chapters and over 1,500 pages, but did not adequately cover regional projections or linkages to impacts. The proposed outline for AR6 features 12 chapters that place greater emphasis on regional climate change, short-lived climate pollutants, and connections across working groups. The goal is to provide more detailed and policy-relevant information to inform adaptation and mitigation efforts.
The document summarizes evidence that the climate is changing faster than usual due to human activities. It discusses how scientists have measured increasing levels of CO2 and other greenhouse gases in the atmosphere since the Industrial Revolution. Measurements from Mauna Loa Observatory since 1957 show that CO2 levels have increased by 1.5-2.5% per year. The Intergovernmental Panel on Climate Change's Fourth Assessment Report in 2007 represented an overwhelming scientific consensus that climate change poses a serious risk and is at least 90% certain to be caused by human activity like burning fossil fuels. The report projected impacts of climate change like rising sea levels, stronger storms, and heat waves.
History of global warming and green houseZeeshan Babu
Svante Arrhenius was the first scientist to propose in 1896 that fossil fuel combustion could lead to global warming through increased CO2 levels in the atmosphere. He suggested doubling CO2 could increase temperatures by 5°C. However, the topic was then forgotten for a long time. In the 1950s-1960s, studies showed CO2 absorbs infrared radiation and warming the planet, and Charles Keeling's measurements of atmospheric CO2 levels became icons of global warming. In 1988, it was acknowledged the climate was warmer than 1880, leading to the founding of the IPCC to study the greenhouse effect. While the data and models are still debated, most recent years have been the warmest on record since 1990.
Global warming is caused primarily by human-induced increases in greenhouse gases from burning fossil fuels and deforestation. The planet's average surface temperature has risen about 1°C since 1900, with about two-thirds of the increase occurring since 1980. If emissions continue at a high rate, global temperatures could increase by 2.4-6.4°C by 2100. Impacts are already apparent and include sea level rise, extreme weather events, and species extinction. Mitigating emissions through policy changes aims to limit further warming to under 2°C.
Global Warming , Greenhouse Gases and ClimateSD Paul
The document discusses evidence that the Earth's surface temperature has increased about 1 degree Fahrenheit over the past century, with accelerated warming in recent decades. This warming is largely attributable to increased greenhouse gas emissions from human activities. However, some uncertainties remain about how the climate responds to these gases. The document also notes there is debate around how much human activities versus natural variations are contributing to increased temperatures. Skeptics argue the data does not clearly show man-made warming or that temperatures have in some cases cooled in recent decades.
The document discusses the history of how global climate change became framed as an issue. It traces ideas from the 1820s about the greenhouse effect to modern events like the Kyoto Protocol and Paris Agreement. Key developments included establishing the Keeling Curve in 1958, Hansen's 1988 congressional testimony, and formation of the IPCC in 1989. Climate change became increasingly politicized over debates around economic costs, conservative ideology, and uncertainty about impacts. Different groups have framed the issue through these lenses to influence public views on climate policy.
Global warming is the increase of Earth's average surface temperature due to greenhouse gases like carbon dioxide trapping heat that would otherwise escape. Earth's climate is influenced by the thin atmosphere layer containing most air. While thin, human emissions make it plausible we can impact climate. Significant greenhouse gases include water vapor and carbon dioxide, which has internal vibrational modes that absorb and re-emit infrared radiation. Carbon dioxide remains in the atmosphere for hundreds of years, acting as a controlling factor rather than reacting one. Human emissions have increased atmospheric carbon dioxide by 30% correlating with fossil fuel use, with future projections showing levels not seen in 50 million years posing serious negative effects.
This document discusses various natural and human factors that can influence climate change. It describes several natural processes such as volcanic eruptions, ocean circulation patterns, solar activity, and Earth's orbital and rotational changes that have short or long-term effects on climate. It also explains how human activities like burning fossil fuels and deforestation have increased greenhouse gases in the atmosphere and led to issues like global warming and ocean acidification. The document provides examples and diagrams to illustrate these concepts and their impacts on climate.
This presentation on climate change was given by Kate Lonsdale.
Kate Lonsdale from the NCVO climate change and BME Communities Project gave this in Manchester on the 1st May 2012.
Find out more about NCVO events: http://www.ncvo.org.uk/training-and-events/events-listing
The document discusses several topics related to global warming:
1. It argues that there is no single "normal" earth temperature and that temperatures have varied significantly over long periods in earth's history, with many periods being warmer than today.
2. It claims the earth has been cooling since 1998 according to satellite data, in contrast to IPCC predictions of steady warming.
3. It asserts there is no scientific consensus on anthropogenic global warming and cites several petitions and analyses that refute the claimed consensus.
4. It argues that CO2 is not a pollutant but rather a naturally occurring gas essential for life, and that levels have been much higher for most of earth's history without negative effects.
Global warming is caused by the greenhouse effect from increased CO2 and other gases trapping heat in the atmosphere. The majority of scientists agree that human activity, such as burning fossil fuels, is the main driver of increased greenhouse gas levels and global temperature rises in recent decades. If emissions continue at their current rate, average global temperatures could increase 4-5°C by 2100, causing sea level rises and more extreme weather. Major changes are needed to transition to renewable energy and reduce CO2 emissions to prevent catastrophic climate change impacts.
The document discusses human-caused global warming and how it can be slowed and stopped through practical actions. While some predictions of global warming effects are exaggerated, the evidence is clear that warming is occurring due to increased greenhouse gases from human activities. Studying factors like glacial melting and climate forcing agents shows that global warming can be addressed by reducing emissions to achieve a healthier atmosphere.
1) The document discusses evidence that human activities like burning fossil fuels and deforestation have increased greenhouse gas levels since the Industrial Revolution and are the main cause of recent global warming.
2) Natural factors alone like variations in solar activity or volcanic eruptions cannot explain the rapid warming seen in recent decades.
3) Some evidence suggests that early human agriculture as far back as 8,000 years ago may have warmed the planet enough to delay the onset of the next ice age.
This document discusses global climate change and its various aspects. It provides an overview of the history and science of global warming, summarizing that increasing greenhouse gas emissions are causing the planet to warm due to human activities. Main greenhouse gases like carbon dioxide, methane, and nitrous oxide are explained in terms of their sources and impacts. The effects of global warming are expected to include continued temperature rise, more extreme weather, sea level rise, and effects on ecosystems. International agreements to address climate change like the UNFCCC and Kyoto Protocol are also summarized.
Global Warming Of The 21st Century Slide Showlenci678
Global warming is a controversial issue with uncertain causes according to the document. While the IPCC argues that human carbon dioxide emissions are the main driver of recent warming, the document notes there are other potential natural causes like the sun, extraterrestrial dust, and changes in cloud cover. The document reviews the evidence for both human and natural causes of climate change and periods of past warming and cooling like the Roman Warming, Dark Ages, Medieval Warming and Little Ice Age. It concludes that climate has varied naturally over millions of years and scientists are still uncertain if current warming is predominantly human-caused or part of this natural variability.
This document discusses greenhouse gases and the greenhouse effect. It describes the major greenhouse gases in Earth's atmosphere, including water vapor, carbon dioxide, methane and nitrous oxide. It explains that while greenhouse gases occur naturally, human activities like burning fossil fuels have substantially increased their levels since the Industrial Revolution. The document also outlines the role of greenhouse gases and water vapor in the greenhouse effect, sources of anthropogenic emissions, how long gases remain in the atmosphere, their global warming potential, and some related effects.
This work is done for students in the promotion of our College Seminar Lady of the Valley, and of course by our English teacher, Jimmy H. profesror Vergara. If I remember, my name Juank.
This document discusses whether climate change is natural or man-made. It first defines climate change as a change directly or indirectly caused by human activity that alters the atmosphere's composition beyond natural variability. It then outlines opinions on the issue and parameters to measure climate change such as temperature, precipitation, sea level, solar activity, volcanic activity, and chemical composition. While some argue multiple factors can cause climate change, data on temperature, precipitation, sea level, and chemical composition suggest human activity is the dominant cause of current climate change. The document concludes natural cycles only have a small effect and recommendations are provided for mitigating climate change.
Global warming is the rise in average global temperatures due to increased greenhouse gas emissions from human activities like burning fossil fuels. Climate models project further global temperature increases between 1.1 to 6.4°C by 2100 depending on emissions levels. Effects of warming include sea level rise, more extreme weather, and species extinction. Most countries have adopted policies through the UNFCCC to reduce emissions and adapt to climate change, with a goal of limiting warming to below 2°C.
IPCC from AR5 to AR6 - WGI Perspectives - by Panmao Zhai, Co-Chair of WGIipcc-media
This document summarizes the key changes from the IPCC Fifth Assessment Report (AR5) to the upcoming Sixth Assessment Report (AR6) on climate change. It notes that AR5 had 14 chapters and over 1,500 pages, but did not adequately cover regional projections or linkages to impacts. The proposed outline for AR6 features 12 chapters that place greater emphasis on regional climate change, short-lived climate pollutants, and connections across working groups. The goal is to provide more detailed and policy-relevant information to inform adaptation and mitigation efforts.
The document summarizes evidence that the climate is changing faster than usual due to human activities. It discusses how scientists have measured increasing levels of CO2 and other greenhouse gases in the atmosphere since the Industrial Revolution. Measurements from Mauna Loa Observatory since 1957 show that CO2 levels have increased by 1.5-2.5% per year. The Intergovernmental Panel on Climate Change's Fourth Assessment Report in 2007 represented an overwhelming scientific consensus that climate change poses a serious risk and is at least 90% certain to be caused by human activity like burning fossil fuels. The report projected impacts of climate change like rising sea levels, stronger storms, and heat waves.
History of global warming and green houseZeeshan Babu
Svante Arrhenius was the first scientist to propose in 1896 that fossil fuel combustion could lead to global warming through increased CO2 levels in the atmosphere. He suggested doubling CO2 could increase temperatures by 5°C. However, the topic was then forgotten for a long time. In the 1950s-1960s, studies showed CO2 absorbs infrared radiation and warming the planet, and Charles Keeling's measurements of atmospheric CO2 levels became icons of global warming. In 1988, it was acknowledged the climate was warmer than 1880, leading to the founding of the IPCC to study the greenhouse effect. While the data and models are still debated, most recent years have been the warmest on record since 1990.
The document contains 14 questions asking about various topics including the tallest building, longest bridge, Justin Bieber's real name, the winner and loser of the 2010 FIFA World Cup, the artist who won the first American Idol competition, the late CEO of Apple, the automobile company that partnered with Proton, the "Crocodile Hunter", the anti-apartheid leader from South Africa, the role played by Paul Walker in Fast and Furious, the oldest university in the UK, the largest lake in the world, the mobile phone manufacturer from Finland, the author of the Harry Potter novels, and the comic company that produced Superman.
O governo brasileiro concluiu cinco leilões de concessão de rodovias federais em 2013. A Invepar arrematou a BR-040 entre Brasília e Juiz de Fora com desconto de 61,13% na tarifa de pedágio. O governo comemorou os resultados que trarão investimentos de R$ 7,4 bilhões na rodovia.
Use this ultimate mover's checklist to learn how to move from start-to-finish, from getting ready and giving notice to arranging your utilities and deliveries to arrive in your new apartment or house.
This document discusses various types of projected audiovisual aids used in teaching. It describes opaque projectors, slide projectors, and overhead projectors. For each type of projector, it provides details on how to operate the equipment, prepare content for projection, and care for the materials and devices. The advantages of projected aids are that they allow visual content to be enlarged for viewing by many students simultaneously in a way that engages their senses of sight and hearing during the learning process. Proper use of these tools enhances teaching effectiveness.
Composição química, atividade antimicrobiana e toxicidade do óleoGleilton Weyne
Este documento resume um estudo sobre a composição química, atividade antimicrobiana e toxicidade do óleo essencial extraído da resina do jatobá (Hymenaea courbaril). O óleo essencial foi analisado por cromatografia gasosa e revelou três principais constituintes: β-cariofileno (60,5%), óxido cariofileno (20,7%) e α-humuleno (2,3%). O óleo apresentou atividade antimicrobiana contra bactérias testadas, com maior efeito
Mensaje de Navidad - Papa Francisco I - Diciembre 2013Oscar Ayala
El Papa Francisco envía un mensaje de Navidad en el que compara a las personas con diferentes símbolos navideños para enfatizar la importancia de iluminar el camino de los demás con bondad, paciencia, alegría y generosidad, y de dar lo mejor de uno mismo sin importar a quién, estableciendo así una Navidad perenne en el interior de cada uno.
The document discusses evidence that human activities are the dominant cause of recent global warming. It summarizes the key pieces of evidence, including rising concentrations of greenhouse gases like carbon dioxide, methane and nitrous oxide in the atmosphere since the Industrial Revolution. The increases in these gases are well above natural levels over the past 800,000 years and are consistent with human emissions from fossil fuel burning and deforestation. Climate models that only include natural factors cannot reproduce the observed global temperature rise in recent decades, while models including human factors can.
Global Warming - A Global Warning....
today Global warming is Rapidly increasingh it is the need of the hour to control it......
for more details about the presentation contact
anishrajgoyal09rockstar@gmail.com
Global climate change and us environmental law power point presentation fi...Sam Bleicher
This document outlines a presentation on global climate change and US environmental law. It discusses the effects of climate change like rising sea levels and more extreme weather. It then explains the causes, like increasing greenhouse gas emissions from human activities like burning fossil fuels. Major sources of emissions are identified as China, the US, and the EU. The cumulative nature of carbon dioxide in the atmosphere is also summarized.
Global warming is real and caused by human activity. The burning of fossil fuels has increased the amount of greenhouse gases like carbon dioxide in the atmosphere beyond what the Earth can absorb naturally. Studies show that small increases in CO2 have led to temperature shifts in the past, and CO2 levels are now higher than in the last 650,000 years. If emissions continue, the effects will include rising sea levels from melting ice caps, flooding of coastal areas, shifts in weather patterns, and more severe storms. The past few decades have been the hottest in centuries, and the Arctic is already experiencing twice the global average warming. Multiple studies find the current warming trend can only be explained by human-caused greenhouse gas emissions.
Global warming is real and caused by human activity. The burning of fossil fuels has increased the amount of greenhouse gases like carbon dioxide in the atmosphere beyond what the Earth can absorb naturally. Studies show that small increases in carbon dioxide have led to temperature shifts in the past, and human activity has increased CO2 levels more than 30% above pre-industrial levels, the highest in 650,000 years. If emissions continue, the effects will include rising sea levels from melting ice caps, shifting weather patterns, and more severe storms. The past few decades have been the hottest in centuries, with the Arctic warming twice as fast as the rest of the world. Multiple studies and scientific organizations agree that the current warming trend is directly caused by human
Global warming is caused by greenhouse gases like carbon dioxide and methane trapping heat in the atmosphere. This is called the greenhouse effect. While the greenhouse effect makes Earth habitable, the additional heat trapped by human emissions is causing problems. Temperatures are rising faster than ever before in human history due to increased CO2 from the burning of fossil fuels. This is harming ecosystems, raising sea levels, and jeopardizing human health and safety. Efforts to reduce emissions through alternatives to fossil fuels and carbon sequestration are needed to slow global warming.
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Assignment 2The Global Environment: An Emerging World View (cont.)
Reading Assignment:
Read Article 5, A safe operating space for humanity by Johan Rockstrom et al. on pages 36-41 in your textbook.
Overview:
This lesson will illustrate understanding of how locally-based activities influence global phenomena as climate change. You will also observe that in a time of disappointing progress is occurring in global initiatives to curb greenhouse gas emissions, one of the most promising paths might be a localized action.
The authors identified planetary boundaries that must not be crossed in order to avoid significant environmental degradation.
Of the 10 factors considered, 3 of them--biodiversity loss, climate change,and agricultural pollution--have already crossed the threshold for a sustainable planet.
Evidence so far suggests that, as long as the thresholds are not crossed, humanity has the freedom to pursue long-term social and economic development.
Topics Covered:Planetary BoundariesClimate ChangeRate of Biodiversity LossNitrogen and Phosphorus CyclesDelicate Balance
Key Terms:
Planetary Boundaries -- boundaries that define the safe operating space for humanity with respect to the Earth system and are associated with the planet’s biophysical subsystems or processes.
Holocene -- the unusually stable environment of the planet for the past 10,000 years, which has seen human civilizations arise, develop, and thrive.
Anthropecene -- an era that has arisen since the Industrial Revolution, in which human actions become the main driver of global environmental change.
EPA -- Environmental Protection Agency (www.epa.gov) for more information.
Greenhouse Gas (GHG)-- an atmospheric gas such as carbon dioxide, water vapor, or methane that easily absorbs infrared radiation & gives off heat, some of it directed toward space & the rest toward Earth.
Carbon Cycle -- the cycle of CO2 in the Earth‘s ecosystem; photosynthetic organisms transform the gas into organic nutrients, which are then restored to a gaseous state by respiration & decay. Instructor's Comments:
Fact 1: Currently, atmospheric CO2 concentration is 31% higher than in 1750, a level that has not been exceeded during the last 420,000 years.
Fact 2: The primary cause is human activity, particularly fossil fuel use & deforestation leading to further increases in CO2.
As we have seen a similar trend in the previous lesson, the following graph illustrates the CO2 concentration (dashes) and the global surface Ts (solid line)
Fact 3: Burning fossil fuels in power plats and automobiles ejects poisonous particles & gases that alter the chemical structure of the Atmosphere.
Fact 4: Worldwide CO2 emissions from burning fossil fuels (coal, oil, and natural gas) reached a record 30.6 Billion metric tons in 2010 that economists and scientist call this as “a wake-up call”. (Source: Int.
Global warming refers to the long-term rise in Earth's average temperature due to human activities like burning fossil fuels. Since pre-industrial times, human activities have increased Earth's average temperature by about 1 degree Celsius. It is unequivocal that human influence has warmed the atmosphere, ocean and land. The greenhouse effect occurs naturally and makes Earth habitable, but human emissions of greenhouse gases like carbon dioxide are enhancing the effect and causing global warming. Continued emissions will lead to more extreme weather, higher sea levels, and other damaging impacts. Addressing global warming will require international cooperation on clean energy and adaptation efforts.
Global warming refers to the long-term rise in Earth's average temperature due to human activities like burning fossil fuels. Since pre-industrial times, human activities have increased Earth's average temperature by about 1 degree Celsius. It is unequivocal that human influence has warmed the atmosphere, ocean, and land. The greenhouse effect occurs naturally and makes Earth habitable, but human emissions of greenhouse gases like carbon dioxide are enhancing the effect and causing global warming. Continued emissions will lead to more extreme weather, higher sea levels, and other damaging impacts. Addressing global warming will require international cooperation on clean energy and adaptation efforts.
Global warming refers to the long-term rise in Earth's average temperature due to human activities like burning fossil fuels. Since pre-industrial times, human activities have increased Earth's average temperature by about 1 degree Celsius. It is unequivocal that human influence has warmed the atmosphere, ocean and land. The greenhouse effect occurs naturally and makes Earth habitable, but human emissions of greenhouse gases like carbon dioxide are enhancing the effect and causing global warming. Continued emissions will lead to more extreme weather, higher sea levels, and other damaging impacts. Addressing global warming will require international cooperation on clean energy and adaptation efforts.
This document discusses climate change across different timescales and possible causes. It notes that climate has varied over geological eras, with ice ages occurring in cycles of around 100,000 years. Historical records show temperature fluctuations, with a cold period from 1400-1850 AD and a warm period from 800-1400 AD. Recent climate data from 1850-2008 shows global temperatures increased by around 0.5°C since the late 1970s, corresponding to an era of global warming. The enhanced greenhouse effect, caused by gases released from burning fossil fuels, has likely contributed to increased warming by trapping more solar radiation. Transportation, industry, electricity, and heating account for over half of all greenhouse gas emissions, with carbon dioxide being the most
This document discusses global warming and potential solutions. It was authored by three students from K.S. Institute of Technology. The document provides an abstract that discusses how industrial emissions pose a risk to nature and humanity. It then discusses the causes of global warming like increased CO2 and methane emissions, deforestation, and fossil fuel usage. The effects of global warming discussed include melting glaciers, climate change, rising sea levels, and more frequent heat waves. Potential solutions proposed are boosting energy efficiency, greening transportation, increasing renewable energy, and reducing deforestation.
This document summarizes several common myths and misconceptions about global warming and refutes them with scientific facts. It explains that while water vapor is a stronger greenhouse gas than carbon dioxide, CO2 levels are determined by human activities like burning fossil fuels. While some effects of warming may seem beneficial, the overall impacts of climate change will be severely damaging. Past climate changes were natural, but current warming is human-caused. And unlike weather, climate projections decades in the future can be reliable because models have been validated against past climate data. The document concludes that urgent action is needed to avoid catastrophic effects of global warming.
The document discusses several topics related to climate change:
1) Recent years have been the hottest on record with rising global temperatures and melting Arctic sea ice. The majority of Americans believe that climate change is occurring.
2) Significant efforts and investments totaling over $1 trillion per year will be needed to transition economies to reduce greenhouse gas emissions and stabilize the climate.
3) Failure to curb emissions could lead to catastrophic impacts like 6°C of warming by 2100 and major sea level rise from melting ice sheets that would displace millions of people globally.
Over millions of years, species become adapted to survive in the conditions in which they live. A stable climate supports this process and allows living things to thrive. If the climate changes quickly, organisms don’t have enough time to adapt to new conditions and may no longer be able to survive.
What is climate change doing to us and for us?Paul H. Carr
What are we doing to our climate? Emissions from fossil fuel burning have raised carbon dioxide concentrations 35% higher than in the last millions of years. This increase is warming our planet via the Greenhouse Effect. What is climate change doing to and for us? Dry regions are drier and wet ones wetter. Wildfires have increased threefold, hurricanes more violent, floods setting record heights, glaciers melting, and seas rising. Parts of Earth are increasingly uninhabitable. Climate change requires us to act as a global community. Climate justice enjoins emitters to pay the social-environmental costs of fossil fuel burning. This would expedite green solar, wind, and next-generation nuclear energy sources. Individuals should conserve resources, waste less food, and eat a plant rich diet.
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Essay about Global Warming
Global warming, air pollution, and toxic chemicals are just a few of the horrible termites slowing tearing away at the environment in which we live. As technology in industrialized community has advanced over the years, there has been an alarming about of toxins released into our atmosphere; causing catastrophic effects to our environment and our bodies. Humans were placed on the top of the hierarchy of all life on earth, it would unethical for us to ignore our responsibility to cultivate, nurture and take care of the earth on which we live.
There are many controversies about Global warming, air pollution and toxic chemicals; environmentalist are studying the origins of the problems and creating solutions to end them. Environmentalist...show more content...Global warming is defined as the warming of the earth s atmosphere due to a high increase of harsh chemicals such as CO2, methane, and nitrous oxide (Rothschild, D. 2007, pg. 8). Global warming is not the cause but rather it is just the daunting result of many causes. The increase in automobile usage causes an increase in the amount of emissions in the air, the increase in air conditioning units, airplanes, with heaters chemical plants and much more are all associated with the causes of global warming.
As a result of this world wide issue, animals such as polar bears and penguins are on the verge of becoming instinct due to the melting of glaciers which is their natural environment. This major problem has translated from first effecting the
Environmental Issues
Through the project the students will learn that the temperature of Earth is increasing which is threat to human civilization.We should minimise the fuel consumption to reduce green house gases.The students will learn real life Mathematics .They will learn to predict the amount of ice amount of Arctic sea by using linear equation.
The amount of sea ice in ( sq km) is a linear function of year.
Some pictures are taken from www.nasaclimate.org
The project was selected for seminar " Development of quality teaching in Mathematics" at RIE, Ajmer under Poster presentation category .
Global warming refers to the rising average temperature of the Earth's atmosphere and oceans over time. The document discusses the causes of global warming, including increased carbon dioxide and methane emissions from human activities like burning fossil fuels and deforestation. The effects of global warming include rising sea levels, more extreme weather events, species extinction, and changes to agricultural yields. While global warming continues to occur, reducing carbon emissions from fossil fuels and preserving carbon sinks can help control the problem.
GraphRAG for Life Science to increase LLM accuracyTomaz Bratanic
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GraphSummit Singapore | The Future of Agility: Supercharging Digital Transfor...Neo4j
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In the rapidly evolving landscape of technologies, XML continues to play a vital role in structuring, storing, and transporting data across diverse systems. The recent advancements in artificial intelligence (AI) present new methodologies for enhancing XML development workflows, introducing efficiency, automation, and intelligent capabilities. This presentation will outline the scope and perspective of utilizing AI in XML development. The potential benefits and the possible pitfalls will be highlighted, providing a balanced view of the subject.
We will explore the capabilities of AI in understanding XML markup languages and autonomously creating structured XML content. Additionally, we will examine the capacity of AI to enrich plain text with appropriate XML markup. Practical examples and methodological guidelines will be provided to elucidate how AI can be effectively prompted to interpret and generate accurate XML markup.
Further emphasis will be placed on the role of AI in developing XSLT, or schemas such as XSD and Schematron. We will address the techniques and strategies adopted to create prompts for generating code, explaining code, or refactoring the code, and the results achieved.
The discussion will extend to how AI can be used to transform XML content. In particular, the focus will be on the use of AI XPath extension functions in XSLT, Schematron, Schematron Quick Fixes, or for XML content refactoring.
The presentation aims to deliver a comprehensive overview of AI usage in XML development, providing attendees with the necessary knowledge to make informed decisions. Whether you’re at the early stages of adopting AI or considering integrating it in advanced XML development, this presentation will cover all levels of expertise.
By highlighting the potential advantages and challenges of integrating AI with XML development tools and languages, the presentation seeks to inspire thoughtful conversation around the future of XML development. We’ll not only delve into the technical aspects of AI-powered XML development but also discuss practical implications and possible future directions.
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HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAUpanagenda
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DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind für viele in der HCL-Community seit letztem Jahr ein heißes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und Lizenzgebühren zu kämpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer möglich. Das verstehen wir und wir möchten Ihnen dabei helfen!
Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt näherbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Überblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
Diese Themen werden behandelt
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- Wie funktionieren CCB- und CCX-Lizenzen wirklich?
- Verstehen des DLAU-Tools und wie man es am besten nutzt
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- Praxisbeispiele und Best Practices zum sofortigen Umsetzen
HCL Notes and Domino License Cost Reduction in the World of DLAUpanagenda
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The introduction of DLAU and the CCB & CCX licensing model caused quite a stir in the HCL community. As a Notes and Domino customer, you may have faced challenges with unexpected user counts and license costs. You probably have questions on how this new licensing approach works and how to benefit from it. Most importantly, you likely have budget constraints and want to save money where possible. Don’t worry, we can help with all of this!
We’ll show you how to fix common misconfigurations that cause higher-than-expected user counts, and how to identify accounts which you can deactivate to save money. There are also frequent patterns that can cause unnecessary cost, like using a person document instead of a mail-in for shared mailboxes. We’ll provide examples and solutions for those as well. And naturally we’ll explain the new licensing model.
Join HCL Ambassador Marc Thomas in this webinar with a special guest appearance from Franz Walder. It will give you the tools and know-how to stay on top of what is going on with Domino licensing. You will be able lower your cost through an optimized configuration and keep it low going forward.
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Cosa hanno in comune un mattoncino Lego e la backdoor XZ?Speck&Tech
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How to Get CNIC Information System with Paksim Ga.pptx
Global warming faq
1. Global Warming FAQ
What is Global Warming?
Global Warming is the increase of Earth's average surface temperature due
to effect of greenhouse gases, such as carbon dioxide emissions from
burning fossil fuels or from deforestation, which trap heat that would
otherwise escape from Earth. This is a type of greenhouse effect.
Is global warming, caused by human activity, even remotely plausible?
Earth's climate is mostly influenced by the first 6 miles or so of the
atmosphere which contains most of the matter making up the atmosphere.
This is really a very thin layer if you think about it. In the book The End of
Nature, author Bill McKibbin tells of walking three miles to from his cabin in
the Adirondack's to buy food. Afterwards, he realized that on this short
journey he had traveled a distance equal to that of the layer of the
atmosphere where almost all the action of our climate is contained. In fact,
if you were to view Earth from space, the principle part of the atmosphere
would only be about as thick as the skin on an onion! Realizing this makes it
more plausible to suppose that human beings can change the climate. A look
at the amount of greenhouse gases we are spewing into the atmosphere (see
below), makes it even more plausible.
What are the Greenhouse Gases?
The most significant greenhouse gas is actually water vapor, not something
produced directly by humankind in significant amounts. However, even
slight increases in atmospheric levels of carbon dioxide (CO2) can cause a
substantial increase in temperature.
Why is this? There are two reasons: First, although the concentrations of
these gases are not nearly as large as that of oxygen and nitrogen (the main
constituents of the atmosphere), neither oxygen or nitrogen are greenhouse
gases. This is because neither has more than two atoms per molecule (i.e.
their molecular forms are O2 and N2, respectively), and so they lack
the internal vibrational modes that molecules with more than two atoms
have. Both water and CO2, for example, have these "internal vibrational
modes", and these vibrational modes can absorb and reradiate infrared
radiation, which causes the greenhouse effect.
2. Secondly, CO2 tends to remain in the atmosphere for a very long time (time
scales in the hundreds of years). Water vapor, on the other hand, can easily
condense or evaporate, depending on local conditions. Water vapor levels
therefore tend to adjust quickly to the prevailing conditions, such that the
energy flows from the Sun and re-radiation from the Earth achieve a
balance. CO2 tends to remain fairly constant and therefore behave as
a controlling factor, rather than a reacting factor. More CO2 means that the
balance occurs at higher temperatures and water vapor levels.
How much have we increased the Atmosphere's CO2 Concentration?
Human beings have increased the CO2 concentration in the atmosphere by
about thirty percent, which is an extremely significant increase, even on
inter-glacial timescales. It is believed that human beings are responsible for
this because the increase is almost perfectly correlated with increases in
fossil fuel combustion, and also due other evidence, such as changes in the
ratios of different carbon isotopes in atmospheric CO2 that are consistent
with "anthropogenic" (human caused) emissions. The simple fact is,
that under "business as usual" conditions, we'll soon reach carbon dioxide
concentrations that haven't been seen on Earth in the last 50 million years.
Combustion of Fossil Fuels, for electricity generation, transportation, and
heating, and also the manufacture of cement, all result in the total
worldwide emission of about 22 billion tons of carbon dioxide to the
atmosphere each year. About a third of this comes from electricity
generation, and another third from transportation, and a third from all
other sources.
This enormous input of CO2 is causing the atmospheric levels of CO2 to rise
dramatically. The following graph shows the CO2 levels over the past 160
thousand years (the upper curve, with units indicated on the right hand side
of the graph). The current level, and projected increase over the next
hundred years if we do not curb emissions, are also shown (the part of the
curve which goes way up high, to the right of the current level, is the
projected CO2 rise). The projected increase in CO2 is very startling and
disturbing. Changes in the Earth's average surface temperature are also
shown (the lower curve, with units on the left). Note that it parallels the
CO2 level curve very well.
3. Is the Temperature Really Changing?
Yes! As everyone has heard from the media, recent years have consistently
been the warmest in hundreds and possibly thousands of years. But that
might be a temporary fluctuation, right? To see that it probably isn't, the
next graph shows the average temperature in the Northern Hemisphere as
determined from many sources, carefully combined, such as tree rings,
corals, human records, etc.
4. These graphs show a very discernable warming trend, starting in about 1900.
It might seem a bit surprising that warming started as early as 1900. How is
this possible? The reason is that the increase in carbon dioxide actually
began in 1800, following the deforestation of much of Northeastern
American and other forested parts of the world. The sharp upswing in
emissions during the industrial revolution further added to this, leading to a
significantly increased carbon dioxide level even by 1900.
Thus, we see that Global Warming is not something far off in the future - in
fact it predates almost every living human being today.
How do we know if the temperature increase is caused by anthropogenic
emissions?
Computer models strongly suggest that this is the case. The following graphs
show that 1) If only natural fluctuations are included in the models (such as
the slight increase in solar output that occurred in the first half of the 20th
century), then the large warming in the 20th century is not reproduced. 2) If
only anthropogenic carbon emissions are included, then the large warming is
reproduced, but some of the variations, such as the cooling period in the
1950s, is not reproduced (this cooling trend was thought to be caused by
sulfur dioxide emissions from dirty power plants). 3) When both natural and
anthropogenic emissions of all types are included, then the temperature
evolution of the 20th century is well reproduced.
5. Is there a connection between the recent drought and climate change?
Yes. A recent study by the National Oceanic and Atmospheric Administration
gives strong evidence that global warming was a major factor. Click here for
more details.
Who studies global warming, and who believes in it?
Most of the scientific community, represented especially by the
Intergovernmental Panel on Climate Change (IPCC - www.ipcc.ch), now
believes that the global warming effect is real, and many corporations, even
including Ford Motor Company, also acknowledge its likelihood.
Who are the IPCC?
In 1998, the Intergovernmental Panel on Climate Change (IPCC) was
established by the World Meteorological Organization (WMO) and the United
Nations Environment Programme (UNEP), in recognition of the threat that
global warming presents to the world.
The IPCC is open to all members of the UNEP and WMO and consists of
several thousand of the most authoritative scientists in the world on climate
6. change. The role of the IPCC is to assess the scientific, technical and socioeconomic information relevant for the understanding of the risk of humaninduced climate change. It does not carry out new research nor does it
monitor climate related data. It bases its assessment mainly on published
and peer reviewed scientific technical literature.
The IPCC has completed two assessment reports, developed methodology
guidelines for national greenhouse gas inventories, special reports and
technical papers. Results of the first assessment (1990--1994): confirmed
scientific basis for global warming but concluded that ``nothing to be said
for certain yet''. The second assessment (1995), concluded that `` ...the
balance suggests a discernable human influence on global climate'', and
concluded that, as predicted by climate models, global temperature will
likely rise by about 1-3.5 Celsius by the year 2100. The next report, in 2000,
suggested, that the climate might warm by as much as 10 degrees
Fahrenheit over the next 100 years, which would bring us back to a climate
not seen since the age of the dinosaurs. The most recent report, in 2001,
concluded that "There is new and stronger evidence that most of the
warming observed over the last 50 years is attributable to human activities".
Due to these assessments, debate has now shifted away from whether or not global
warming is going to occur to, instead, how much, how soon, and with what impacts.
Global Warming Impacts
Many of the following "harbingers" and "fingerprints" are now well under way:
1. Rising Seas--- inundation of fresh water marshlands (the everglades), low-lying
cities, and islands with seawater.
2. Changes in rainfall patterns --- droughts and fires in some areas, flooding in
other areas. See the section above on the recent droughts, for example!
3. Increased likelihood of extreme events--- such as flooding, hurricanes, etc.
4. Melting of the ice caps --- loss of habitat near the poles. Polar bears are now
thought to be greatly endangered by the shortening of their feeding season due
to dwindling ice packs.
5. Melting glaciers - significant melting of old glaciers is already observed.
6. Widespread vanishing of animal populations --- following widespread habitat
loss.
7. Spread of disease --- migration of diseases such as malaria to new, now
warmer, regions.
8. Bleaching of Coral Reefs due to warming seas and acidification due to
carbonic acid formation --- One third of coral reefs now appear to have been
severely damaged by warming seas.
7. 9. Loss of Plankton due to warming seas --- The enormous (900 mile long)
Aleution island ecosystems of orcas (killer whales), sea lions, sea otters, sea
urchins, kelp beds, and fish populations, appears to have collapsed due to loss
of plankton, leading to loss of sea lions, leading orcas to eat too many sea
otters, leading to urchin explosions, leading to loss of kelp beds and their
associated fish populations.
Where do we need to reduce emissions?
In reality, we will need to work on all fronts - 10% here, 5% here, etc, and work to
phase in new technologies, such as hydrogen technology, as quickly as possible. To
satisfy the Kyoto protocol, developed countries would be required to cut back their
emissions by a total of 5.2 % between 2008 and 2012 from 1990 levels. Specifically,
the US would have to reduce its presently projected 2010 annual emissions by 400
million tons of CO2 . One should keep in mind though, that even Kyoto would only go a
little ways towards solving the problem. In reality, much more needs to be done.
The most promising sector for near term reductions is widely thought to be coal-fired
electricity. Wind power, for example, can make substantial cuts in these emissions in
the near term, as can energy efficiency, and also the increased use of high efficiency
natural gas generation.
The potential impact of efficiency should not be underestimated: A 1991 report to
Congress by the U.S. National Academy of Sciences, Policy Implications of Greenhouse
Warming, found that the U.S. could reduce current emissions by 50 percent at zero
cost to the economy as a result of full use of cost-effective efficiency improvements.
Discussing Global Climate Change:
Here is a useful list of facts and ideas:
1. Given the strong scientific consensus, the onus should now be on
the producers of CO2 emissions to show that there is not a problem, if they still
even attempt to make that claim. Its time to acknowledge that we are, at very
least, conducting a very dangerous experiment with Earth's climate.
2. A direct look at the data itself is very convincing and hard to argue with. Ask a
skeptical person to look at the data above. The implications are obvious. The
best source of data is probably the IPCC reports themselves, which are
available at www.ipcc.ch (see, for example, the summaries for policy makers).
3. The recent, record-breaking warm years are unprecedented and statistically
significant. It is a fact that they are very statistically unlikely to be a
fluctuation (and now we can point to specific side effects from those warm
temperatures that appear to have induced recent worldwide drought).
4. Lastly, but perhaps most importantly, whether or not you believe in global
warming per se, the fact remains that the carbon dioxide levels are rising
8. dramatically --- there is no debate about this. If we continue to use fossil fuels
in the way we presently do, then the amount of carbon we will release will
soon exceed the amount of carbon in the living biosphere. This is bound to
have very serious, very negative effects, some of which, such as lowering the
pH of the ocean such that coral cannot grow, are already well known.
Response of Government: Develop "Carbon Sequestration" Technology
Many government agencies around the world are very interested in maintaining fossil
fuel use, especially coal. It should be noted that US energy use, which is enormous, is
increasing, not decreasing. Furthermore, we are not going to run out of coal in the
near term (oil may begin to run low sometime after 2010). Methods for reducing
carbon emission levels while still burning coal are now investigation by government
and industry, as we now discuss.
We believe that a major increase in renewable energy use should be achieved to help
offset global warming. While there are some US government programs aimed in this
direction, there is simply not enough money being spent yet to achieve this goal in a
timely manner. A primary goal of many new programs is not to increase renewables,
but rather, is to find ways to capture the extra CO2 from electricity generation plants
and "sequester" it in the ground, the ocean, or by having plants and soil organisms
absorb more of it from the air.
Possible Problems with Carbon "Sequestration"
One of the Carbon sequestration approaches under investigation is the possibility of
depositing CO2 extracted from emission streams in large pools on the Ocean bottom. It
is possible that such pools will not be stable, and may either erupt to the surface, or
diffuse into the ocean and alter the oceans pH.
Another scheme under investigation is the idea of stimulating phytoplankton growth
on the ocean surface by dusting the surface with iron (the limiting nutrient). This will
cause an increased uptake of carbon by the plankton, part of which will find its way
to the ocean bottom. Fishing companies are considering using this to increase fish
harvests while simultaneously getting credit for carbon sequestration. Serious
ecological disruptions could occur, however, especially if this approach is conducted
on a sufficiently large scale.
Another idea is to stimulate Earth's terrestrial ecosystems to take up more carbon
dioxide. While the impacts here are more difficult to ascertain, an important point to
note is that these systems are not thought to be able to completely absorb all the
extra CO2 . At best, they may be sufficient to help the US stabilize carbon emission
rates for a few decades, but even if this is achieved, stabilization of rates are not
likely to return the Earth to pre-industrial carbon levels. Worse, biological feedbacks
to global warming, such as forest fires, drying soils, rotting permafrost, etc, may
9. actually greatly accelerate carbon emissions, i.e. we may experience massive
carbon de-sequestration.
Another major approach under consideration is to pump CO2 into old oil and gas wells.
While seemingly attractive, it must be kept in mind that for this to be truly effective,
it would have to be done on a world wide scale, include many sources of CO 2 ,
including many sources which are presently small and widely distributed (such as car
emissions, and not just coal plant emissions). All of this CO2 would need to be
captured, transported, injected into old wells, and then the wells would need to be
sealed and monitored. It is not clear that this would be affordable at all, and that
there would be adequate capacity or assurance that CO2 would not leak out in
massive quantities.
In the worst case scenario, carbon sequestration efforts may simply fail, but also end
up being a political tool that is used to seriously delay a transition to renewable
energy sources, and also possibly create many new environmental problems problems
while prolonging old ones.
In the best case scenario, given the truly enormous amount of CO2 we are presently
emitting, some sequestration approaches may serve as a useful bridge to curbing
emissions while the transition to renewables is being made.
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