http://earthobservatory.nasa.gov/Features/GlobalWarming/
This is a good site because the author is qualified to write this paper. The paper is informational and lists its date.
http://www.bestglobalwarmingarticles.com/Article/global-warming-articles----Facts-about-Global-Warming-You-Should-Know-/4116
This isnt a good site because the author isnt contactable and doesnt seem to be qualified since there isnt any information on them.
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