HELP a grad student..?
Answer:
Start with the IPCC:
http://ipcc-wg1.ucar.edu/wg1/report/ar4w...
http://ipcc-wg1.ucar.edu/wg1/report/ar4w...
http://ipcc-wg1.ucar.edu/wg1/report/ar4w...
Each of these has extensive references (I mean hundreds) with original research.
These articles link to sources.
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