GREEN HOUSE EFFECTANDGLOBAL WARMING ASHISH KUMAR AFB- 2011-13003
INTRODUCTION Global warming refers to the rising average temperature of Earths atmosphere and oceans. In the last 100 years, Earths 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.
GREENHOUSE VS GLOBALWARMING 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
How Global Warming Works Carbon Dioxide (CO2)Fossil fuels (coal, oil, natural gas)
HOW CO2 CONNECTED TO GLOBALWARMING? 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.
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
Methane (CH4) Source: Rice cultivation, cattle & sheep ranching, decay from landfills, mining Anthropogenic increase: 145% Average atmospheric residence time: 7-10 yearsNitrous oxide (N2O) Source: Industry and agriculture (fertilizers) Anthropogenic increase: 15% Average atmospheric residence time: 140-190 years
Example of the Greenhouse Effect The Sun’s energy passes through the car’s windshield.This energy (heat) istrapped inside the carand cannot pass backthrough the windshield,causing the inside of thecar to warm up.
Effects of Global Warming Rising Sea Level Increased Temperature Habitat Damage and Species Affected Changes in Water Supply
What’s the proof thatglobal warming is taking place?
Portage Glacier • Alaska 1914 2010Photos: NOAA Photo Collection and Gary Braasch – WorldViewOfGlobalWarming.org
Colorado River• Arizona June 2002 Dec 2008
What’s being done now to reduce our emissions?Wind Power Solar Power Fuel-Efficiency
We can stop global warming!Scientists agree that theburning of fossil fuels iscausing global warming.Since these fuels areburned for energy, andeveryone uses energy,everyone can help stopglobal warming just byusing less energy or energyfrom renewable sources!
How we can reduce global warming?
Simple Things To Do 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.
Simple Things To Do 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.
CONCLUSION Most warming is probably the result of human activities. There will be positive and negative (mostly) repercussions from global warming.