1. Green House Effect & Global Warming

2. What is a Green House that farmers use to grow plants?

5. Function of the Green House
The green house is made up of glass or plastic (walls and roof)
Allows sunlight to filter through and warms up the air
The heat is also absorbed by plants, soil and other objects

6. Function of the Green House
The heated surfaces emit heat back in the atmosphere in the form of infrared radiation
Infrared radiation has difficulty leaving the green house and cannot escape
The glass in the green house traps the infrared radiation or heat

7. Green House Effect
Particular gases in the earth’s atmosphere acts like the glass in the green house
These gases are called Green House Gases.
Eg. Carbon dioxide, Methane, CFC

8. Green House Effect
Green house gases are responsible for keeping the earth warm
Without these gases the earth would be too cold for organisms to exist

11. Green House Effect
Some of the radiation from the sun is reflected by the earth’s surface and atmosphere
Some is absorbed by the earth’s ocean and land
The warmed ocean and land then emit infrared radiation (heat)

12. Green House Effect Not all this infrared radiation goes to space
Some is trapped by the green house gases, keeping the earth warm

13. WHY? The earth’s temperature must remain constant
We must not upset the balance of the gases
WHY?

14. Do man’s activities produce green house gases?

15. Yes

16. Example:
-Burning of fossil fuels
- Cutting of trees
- Use of CFC’s

18. Therefore we have an increase of green house gases in the atmosphere.
What do you think will be the result of an increase in green house gases?

19. A lot of scientists agree that man’s activities are making the natural green house effect strongerOR
Some scientists will say “Enhancing green house effect”

20. Global Warming More green house gases
More heat ( infrared heat) is trapped
Increase in temperature
Earth gets warmer
Global warming

21. Global Warming
Global warming is defined as the increase of the Earth’s surface temperature due to a build up of green house gases in the atmosphere

22. Effects of Global Warming
Rise in temperature can be terrible for us
High temperature will make the ice caps melt

25. Effects of Global Warming
This will cause sea levels to rise
Coastal flooding harming plants and animals

26. Effects of Global Warming
Changes in weather patterns due to the change in proportion of more water to land
Some areas will have:
-Storms
- Drought
- Increase in rainfall

27. Effect of Global Warming
Changes in weather can have an effect on production of crops. This will lead in some countries not having enough food.
Future Carbon Emissions 
will probably increase, especially in China and developing countries 
This will result in a likely doubling of carbon dioxide levels within 150 years, due to 
Increased coal usage 
And increased natural gas usage, 
although petroleum usage is likely to decrease due to increased cost and decreasing supply 

28. Global Warming
As temperature and weather changes, homes of plants and animals will be affected
Example:
- when the ice in the Arctic melts, polar beers and seals will have to find a new home

29. Each of us must take steps to protect our Earth's climate.
Our take-home message…
Each of us must take steps to protect our Earth's climate.