North America is very populated and with the endless number of people comes pollution. Chemicals such as pesticides are used by farmers to stop insects from killing crops but intern kills of other animals such as birds. DDT was a big problem in North America when used as a pesticide. Farmers sprayed in on crops the insects lived either on or near the crops, then smaller animals ate the insects, such as a mouse. Then a snake could eat the mouse and then a hawk could eat the snake. The DDT gets built up in every food chain level and since it can not be decomposed when the hawk dies the DDT goes back into the environment. The chemicals contribute to air and water pollution as well as too many vehicles on the road, industrial plants and other areas that use fossil fuels to run.
Sunday, February 28, 2010
North America - Pollution
North America is very populated and with the endless number of people comes pollution. Chemicals such as pesticides are used by farmers to stop insects from killing crops but intern kills of other animals such as birds. DDT was a big problem in North America when used as a pesticide. Farmers sprayed in on crops the insects lived either on or near the crops, then smaller animals ate the insects, such as a mouse. Then a snake could eat the mouse and then a hawk could eat the snake. The DDT gets built up in every food chain level and since it can not be decomposed when the hawk dies the DDT goes back into the environment. The chemicals contribute to air and water pollution as well as too many vehicles on the road, industrial plants and other areas that use fossil fuels to run.
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