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ASHISH KUMARAFB- 2011-13003
GREEN HOUSE EFFECT AND GLOBAL WARMING
INTRODUCTION
Global warming refers 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.
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
How Global Warming Works
Fossil fuels (coal, oil, natural gas)
Carbon Dioxide (CO2)
HOW CO2 CONNECTED TO 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.
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 years
Nitrous oxide (N2O) Source: Industry and agriculture (fertilizers) Anthropogenic increase: 15% Average atmospheric residence time: 140-190 years
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.
Example of the Greenhouse Effect
GREENHOUSE EFFECT
Sun
Effects of Global WarmingIncreased Temperature
Habitat Damage and
Species AffectedChanges in Water
Supply
Rising Sea Level
What’s the proof that global warming is
taking place?
Portage Glacier
1914 2010
• Alaska
Photos: NOAA Photo Collection and Gary Braasch – WorldViewOfGlobalWarming.org
Colorado River• Arizona
June 2002 Dec 2008
What’s being done now to reduce our emissions?
Solar Power Wind Power Fuel-Efficiency
We can stop global 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!
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.
A
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.