http://epa.gov/climatechange/kids/index.html
http://www.timeforkids.com/TFK/specials/articles/0
6709
http://www.dnr.state.wi.us/org/caer/ce/eek/earth/air/global.htm
http://www.esa.int/esaKIDSen/SEMZ3LXJD1E_Earth_0.html
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