global warming presentation..Presentation Transcript
Global warming…. Contents covered• Introduction• History• Causes• Effects• Global warming and climate change• Graph• Facts• Why is global warming a concern• Steps to be taken
Introduction• Global warming refers to the rising average temperature of Earths atmosphere and oceans, which began to increase in the late 19th century and is projected to continue rising.• The Earths average surface temperature, expressed as a linear trend, rose by 0.74±0.18 °C over the period 1906–2005.• Currently global warming has lead to a great extent resulting in tremendous changes in the earth.
History of earth• Earth formed ~4.6 billion years ago originally very hot• Sun’s energy output only 70% of present• Liquid water present ~4.3 billion years ago• Much of the earth’s early history erased during late heavy bombardment (~3.9 billion years ago )
• Deforestation• Green house gasses• Chloro - fluoro carbons• Combustion of fossil fuels
Major Cause Air pollution• Excessive Use Of Automobiles• Hazardous Industrial Gases• Thermal Power Plants• Smoke And Fumes
Effects of global warming• Melting ice : melting ice caps will throw the global ecosystem out of balance.• Flooding :represents one of the most dangerous hazards to human settlements and is one of the most potentially momentous impacts of global warming.• Hurricane :ocean temperature is a key factor for hurricane formation• Smog :A powerful combination of vehicular fumes, ground-level ozone, airborne industries.
Other effects ofglobal warming
Energy utilization 18% 11% 9% 5% 3% 11% 4% 39%Fridge TV Fan Computer AC Heater/Geyser Appliances Light
Facts• Without the atmosphere to create a greenhouse- type effect, the average temperature on Earth would be just 5° Fahrenheit (F).g• According to NASA studies, average temperatures around the world have increased 1.4° F since 1880, with most of the change occurring in recent decades.f• As Arctic ice rapidly disappears, scientists believe the Arctic will experience its first ice-free summer as early as the year 2040.f• Between the years 1961 and 1997, the world’s glaciers lost 890 cubic miles of ice.b
Facts• Fossil fuel burning currently adds nearly six billion tons of CO2 to the atmosphere every year. Only half of this CO2 is removed by forests and oceans.e• Cars amount to three-quarters of all transportation emissions. At the current rate, the world will be driven on by more than a billion cars in 2030 and a billion more by 2050.g• Scientists estimate that just 20,000 to 25,000 polar bears still survive in the wild.g• The earth’s atmosphere now contains 40% more CO2 than before the Industrial Revolution.g
Why is global warming a concern ?• The Rapid Rise In Greenhouse Gases Is A Problem Because It Is Changing The Climate Faster Than Some Living Things May Be Able To Adapt.• historically, earth’s climate has regularly shifted Back And Forth Between Temperatures Like Those We See Today ..• Now, With Concentrations Of Greenhouse Gases Rising, earth’s remaining ice sheets (such as greenland and Antarctica)• As The Mercury Rises, The Climate Can Change In Unexpected Ways.
Steps to be taken• Clean or replace filters on your furnace and air conditioner• Choose energy efficient appliances when making new purchase• Do not leave appliances on standby• Get a home energy audit• Use less hot water• Recycle your organic waste• Reuse your shopping bag• Reduce waste•
Steps to be taken• Buy organic foods as much as possible• Drive carefully and do not waste fuel• Protect and conserve forest worldwide• Encourage the switch to renewable energy• When it is time for a new car, choose a more fuel efficient vehicle• Try creating awareness among your society.• Plant a tree