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http://www.nfu.org/issues/environment/carbon-credits/

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http://www.google.com/search?q=carbon+credits&rls=com.microsoft:en-us&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1

http://www.washingtonpost.com/wp-dyn/content/article/2007/07/19/AR2007071902553.html

http://www.e-bluehorizons.com/?gclid=CKC1oqnD_o0CFQPrYgod7T8bLg

http://en.wikipedia.org/wiki/Carbon_credits

http://newsbusters.org/node/10989