What is global warming ?

Global warming is an increase in the average temperature of the earth's atmosphere (especially a sustained increase that causes climatic changes)and increase in the earth's atmospheric and oceanic temperatures widely predicted to occur due to an increase in the greenhouse effect resulting especially from pollution. The progressive gradual rise of the earth's surface temperature thought to be caused by the greenhouse effect and responsible for changes in global climate patterns. An overall increase in world temperatures which may be caused by additional heat being trapped by greenhouse gases.
The term given to the major consequence of the greenhouse effect.
The three main causes of global warming ?

1. Green house effects
2. increase global temperatures
3. the emission of green house gases

What are the main effects of global warming ?
1. rise in sea levels
2. rise in temperature
3. change in precipitation
www.environmentalgraffiti.com/...effects...global-warming/276
environment.nationalgeographic.com/.../global-warming/gw-effects.html

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