What is global warming? On what does it depend?

Explanation

1. Global warming is increased temperature of the earth.
2. This is mainly caused by greenhouse effect.
3. Global warming depends upon the amount of `CO_(2)` and other greenhouse gases present in the atmosphere.
4. An increase in `CO_(2)` concentration increases the earth's temperature by retaining more heat.
5. Carnon dioxide increases temperature by about 50%, CFCs increase it by 20% and methane increases it by 15% whereas other pollutants increase it by 10%. Atmosphere air pollution, industrialization and greenhouse effect cause global warming.