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Bily, Cynthia A.. Global Warming . San Diego: Greenhaven Press, 2006. Print.

 

"BrainPOP | Science | Humans and the Environment." BrainPOP . BrainPOP, n.d. Web. 8 Mar. 2011. <http://www.brainpop.com/science/ourfragileenvironment/humansandtheenvironment/>. 

 

"General Pollution." Chemactive. N.p., 6 June 2006. Web. 8 Mar. 2011. <www.chemactive.com/ppt/ib/pollution_general.ppt >.

 

Maczulak, Anne E.. Pollution: Treating Environmental Toxins. New York: Facts on File, 2010. Print.

"Energy Resources." Andy Darvill's Science Site. N.p., n.d. Web. 21 Mar. 2011. .

"Independent Statistics and Analysis." U.S. Energy Information Administration. N.p., n.d. Web. 17 Mar. 2011. .

"Recycling 101." Earth911.com . N.p., n.d. Web. 23 Mar. 2011. .