Green house effect

1. Green house effect

2. Meaning:
 Progressivewarming up of the earth surface due to high concentrationof
manmade carbon dioxide in the atmosphe.
 Concentration of CO₂ works like a glass panel of greenhouse allowing short
wave incoming solar radiation to come in but preventing the long wave
heat to re-radiated out.
 The natural outcome is warmer atmosphere -100 years ago CO 2 -
275ppmIn the year 2007- 375ppmIn the year 2040- 450ppm

3. The major green house gases
 The gases with the properties of greenhouse are known as greenhouse
gases
 Some gases in earth's atmosphere for example,water (H,O), carbon
dioxide (CO), methane (CH), and nitrous oxide (NO) have a very special
property.They do not absorb the visible light from the sun, but they do
absorb the infrared light radiated by the Earth's surface. These are called
"greenhouse gases".
 Carbon dioxide.
 Halogen gases like Chlorofluorocarbons,
 Nitrogen oxide,
 Methane etc.

4. Gas type responsible
 Percentage
 CO2
 Methane
 CFC
 N₂O
 Others

5. Sources of greenhouse gases
 Thermal power stations based on fossil fuels,mainly coal and mineral oil
emitting huge amount of CO₂.
 Numerous factories and industrial chimney wastes.
 Automobiles.
 Deforestation and burning of fossil fuels.

6. Effects of Greenhouse effect
 15 global warming and climate change.
 Rise of sea level.
 Worsening health effects.
 Disruption of the water cycle.
 Changing forest and natural areas.
 Challenges to agriculture and the food supply.
 Effect on the ozone layer.
 Effect on oceanic climate

7. Example:

8. Control of Greenhouse Effect
 Alternate sources of energy are to be used.
 Advanced and efficient technologies for reducing emissions from fossil
fuels.
 Afforestation and reforestation on a large scale.
 Water logging shouldbe avoided.
 Reduction of the use of CFC.
 Carbon market.

9. Global warming and Climate change
 The Sun's surface, which has an average temperature of 10,000 degrees
Fahrenheit (5810degrees Kelvin), primarily radiates visiblelight.
 The surface of the Earth has an average temperature of 60 degrees
Fahrenheit (288 degrees Kelvin),so it radiates in the infrared part of the
spectrum. The temperature of an object is determinedby a balance
between incoming and outgoing energy.

10. Who is responsible?
 Affluent and rich countries are responsible for changes of climate.
 Global energy consumption and CO₂ emissionshave increased3 times
between 1950 - 85.In 1990 out of 21 billion tons of global emissions, 14 billion
tons are emittedby rich countries.
 US alone emitted5 billiontons of carbon.
 India emits 159 million tons.