Lucas+A.

"Environmental History Timeline." Web. 09 Feb. 2011. .

"Pollution Prevention Act of 1990, United States." //Encyclopedia of Earth//. Web. 09 Feb. 2011. .

"History - Water, Effects, Environmental, Disasters, Pollutants, United States, Chemicals, Industrial, Wells, Toxic, World, Human, Power, Sources, Disposal, Use, Life, Health." //Pollution Issues//. Web. 09 Feb. 2011. 

This website gave me some good facts check it out "Duke Energy To Spend $93 Million To Resolve Clean Air Act." //Pollution Online: Digital Marketplace for the Pollution Prevention Industry//. Web. 11 Feb. 2011. [].