Ashu g lobal

Ashu g lobal

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  GREEN HOUSE EFFECT AND GLOBALWARMING ASHISH KUMAR AFB- 2011-13003
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  INTRODUCTION  Global warmingrefers to the rising average temperature of Earth's atmosphere and oceans.  In the last 100 years, Earth's average surface temperature increased by about 0.8 °C (1.4 °F) with about two thirds of the increase occurring over just the last three decades.
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  GREENHOUSE VS GLOBAL WARMING  The greenhouse effect & global warming are not the same thing.  Global warming refers to a rise in the temperature of the surface of the earth.  An increase in the concentration of greenhouse gases leads to an increase in the the magnitude of the greenhouse effect. (Called enhanced greenhouse effect)  This results in Global warming
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  How Global Warming Works Carbon Dioxide (CO2) Fossil fuels (coal, oil, natural gas)
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  HOW CO2 CONNECTEDTO GLOBAL WARMING?  Physically, via the greenhouse effect.  The connection is usually made via the use of a climate model.  If the scenario run results show warmer surface condition than the control, then it is plausible to suspect that the increasing CO2 concentration in the atmosphere may cause warming.
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  SELECTED GREENHOUSE GASES  Naturally occurring amounts of greenhouse gases have a mean warming effect of about 33 °C (59 °F)  The major greenhouse gases are water vapor which causes about 36–70 percent of the greenhouse effect Carbon Dioxide (CO2)  Source: Fossil fuel burning, deforestation  Anthropogenic increase: 30%  Average atmospheric residence time: 500 years
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  Methane (CH4)  Source: Rice cultivation, cattle & sheep ranching, decay from landfills, mining  Anthropogenic increase: 145%  Average atmospheric residence time: 7-10 years Nitrous oxide (N2O)  Source: Industry and agriculture (fertilizers)  Anthropogenic increase: 15%  Average atmospheric residence time: 140-190 years
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  Example of the Greenhouse Effect The Sun’s energy passes through the car’s windshield. This energy (heat) is trapped inside the car and cannot pass back through the windshield, causing the inside of the car to warm up.
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  GREENHOUSE EFFECT Sun
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  Effects of GlobalWarming Rising Sea Level Increased Temperature Habitat Damage and Species Affected Changes in Water Supply
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  What’s the proofthat global warming is taking place?
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  Portage Glacier • Alaska 1914 2010 Photos: NOAA Photo Collection and Gary Braasch – WorldViewOfGlobalWarming.org
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  Colorado River • Arizona June 2002 Dec 2008
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  What’s being donenow to reduce our emissions? Wind Power Solar Power Fuel-Efficiency
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  We can stopglobal warming! Scientists agree that the burning of fossil fuels is causing global warming. Since these fuels are burned for energy, and everyone uses energy, everyone can help stop global warming just by using less energy or energy from renewable sources!
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  How we canreduce global warming?
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  Simple Things ToDo Turn off your computer or the TV when you’re not using it. Take shorter showers. Heating water uses energy. Keep rooms cool by closing the blinds, shades, or curtains. Turn off the lights when you leave a room. Use compact fluorescent bulbs.
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  Simple Things ToDo Dress lightly when it’s hot instead of turning up the air conditioning. Or use a fan. keep the air filters on your AC and furnace clean. Walk short distances instead of asking for a ride in the car. Plant a tree. Recycle.
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  CONCLUSION  Most warmingis probably the result of human activities.  There will be positive and negative (mostly) repercussions from global warming.