Global warming is when the earth heats up. It happens when green house gases trap light and heat from the sun in the earths atmosphere, whitch causing the heat. This effects people, animals, and plants.
The green house effect is, the temperature rises because the suns heat and light is trapped in the earths atmosphere.
Global warming is affecting the world in many ways such as, making the sea and water rise on many low land areas. The water covers the plants whitch cause some to die. When they die, the animals loose a sourse of food, along with there habitat.
http://library.thinkquest.org/CR0215471/global_warming.htm
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