Sunday, May 6, 2007

Some causes of global warming


In this century we are facing many environment problems which can make a change in our atmosphere. One of the most dangerous problems is global warming. This problem cased by different sources. In this paragraph I will write about some causes of global warming.
The first cause is greenhouse effect. The dynamic of this phenomenon is when the Greenhouse gases go into the atmosphere. And the main principle of greenhouse gas is carbon dioxide which comes from cars, trucks, airplanes and Buildings. Also, solar variation can affect our plant by making the earth warmer which increases our global surface temperature from 10 to 30%. Another cause is industrial factories which produce smoke. Final cases is world population which will increased by quarter, day after day.

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