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In the earths long history there have been many periods of global warming

often followed by centuries of cold

scientists wonder if human activities might be contributing to global warming

green house effect

trading heat within the atmosphere

greenhouse help to insulate the earth to keep it warm

biological magnification

pesticides get passed along through the food chain

rapid human growth will keep contributing to pollution problem unless some well thought solutions are set in place

life style changes

reduce pollution govt regulations to back up proven research o reduce environment problems