SOURCES

Air Liquide Encyclopedia. 2006. Air Liquide. 15 April 2007. <http://encyclopedia.airliquide.com/Encyclopedia.asp?GasID=41>

Human Influence.  GHG Online. 15 April 2007. <www.ghgonline.org>

Natural Gas.  U.S. Department of Energy. 30 May 2007 <http://www.energy.gov/energysources/naturalgas.htm>

Natural Gas Supply Association. 2004. FERC. 15 April 2007.  <www.naturalgas.org>

US EPA.  19 October 2006.  Environmental Protection Agency.  15 April 2007. http://www.epa.gov/methane/projections.html

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