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.
Sixty-six million years ago, an asteroid approximately 9km in diameter hit the hydrocarbon- and
sulfur-rich sedimentary rocks in what is now Mexico. Recent studies have shown that this impact at
the Yucatan Peninsula heated the hydrocarbon and sulfur in these rocks, forming stratospheric soot
and sulfate aerosols and causing extreme global cooling and drought. These events triggered a mass
extinction, including dinosaurs, and led to the subsequent macroevolution of mammals. The amount
of hydrocarbon and sulfur in rocks varies widely, depending on location, which suggests that cooling
and extinction levels were dependent on impact site. Here we show that the probability of signifcant
global cooling, mass extinction, and the subsequent appearance of mammals was quite low after an
asteroid impact on the Earthās surface. This signifcant event could have occurred if the asteroid hit the
hydrocarbon-rich areas occupying approximately 13% of the Earthās surface. The site of asteroid impact,
therefore, changed the history of life on Earth.
Sixty-six million years ago, an asteroid approximately 9km in diameter hit the hydrocarbon- and
sulfur-rich sedimentary rocks in what is now Mexico. Recent studies have shown that this impact at
the Yucatan Peninsula heated the hydrocarbon and sulfur in these rocks, forming stratospheric soot
and sulfate aerosols and causing extreme global cooling and drought. These events triggered a mass
extinction, including dinosaurs, and led to the subsequent macroevolution of mammals. The amount
of hydrocarbon and sulfur in rocks varies widely, depending on location, which suggests that cooling
and extinction levels were dependent on impact site. Here we show that the probability of signifcant
global cooling, mass extinction, and the subsequent appearance of mammals was quite low after an
asteroid impact on the Earthās surface. This signifcant event could have occurred if the asteroid hit the
hydrocarbon-rich areas occupying approximately 13% of the Earthās surface. The site of asteroid impact,
therefore, changed the history of life on Earth.
Lecture power point of Climate change Adaptation and Mitigation for Department of Natural Resource Management. This short lecture power point is prepared by Mengistu Tilahun
Thanks!!!
Climate: Climatic Change - Evidence, Cycles and The Futuregeomillie
Ā
A PowerPoint used in class to cover the key forms of evidence you need to know for the Exam. Key Questions are likely to be focused on how we can gain information of past climatic change, and how it can be used to predict future, and I would expect you to be able to comment on the usefulness of the different types. For instance, Ice cores are highly accurate and quantifiable evidence, but gaining them is expensive, and only gives a climatic record for the site at which the snow formed. However, they do provide the longest record of change.
a change in global or regional climate patterns, in particular a change apparent from the mid to late 20th century onwards and attributed largely to the increased levels of atmospheric carbon dioxide produced by the use of fossil fuels.
Climate Change Basics: Issues and Impacts for BoatingNASBLA
Ā
State Climatologist David Zierden presented Climate Change Basics: Issues and Impacts for Boating to the National Association of State Boating Law Administrators on September 9, 2008
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
Lecture power point of Climate change Adaptation and Mitigation for Department of Natural Resource Management. This short lecture power point is prepared by Mengistu Tilahun
Thanks!!!
Climate: Climatic Change - Evidence, Cycles and The Futuregeomillie
Ā
A PowerPoint used in class to cover the key forms of evidence you need to know for the Exam. Key Questions are likely to be focused on how we can gain information of past climatic change, and how it can be used to predict future, and I would expect you to be able to comment on the usefulness of the different types. For instance, Ice cores are highly accurate and quantifiable evidence, but gaining them is expensive, and only gives a climatic record for the site at which the snow formed. However, they do provide the longest record of change.
a change in global or regional climate patterns, in particular a change apparent from the mid to late 20th century onwards and attributed largely to the increased levels of atmospheric carbon dioxide produced by the use of fossil fuels.
Climate Change Basics: Issues and Impacts for BoatingNASBLA
Ā
State Climatologist David Zierden presented Climate Change Basics: Issues and Impacts for Boating to the National Association of State Boating Law Administrators on September 9, 2008
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 is climate change doing to us and for us?Paul H. Carr
Ā
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.
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 .
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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
The EXPLODING POPULATION OF 7 B IS INFLUENCING OUR CLIMATE BY BURNING FOSSIL FUELS THAT EMIT CARBON DIOXIDE, CO2.
1. THE HUMAN INFLUENCE ON WARMING
Emissions of the greenhouse gas CO2 are increasing at a rate of 2.5 ppm per year.
2. CONTRAST THIS WITH SLOWER NATURAL PROCESSES
18K ā 10K years ago, C02 increased at a rate 1/300th slower.
3. THE IMPACT OF CONTINUING CLIMATE CHANGE
Melting of the Arctic is increasing our winter climate extremes.
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