Global warming whodunit

After my recent column about Dr. Jim Hansen's global warming research, I received e-mails with dozens of references designed to convince me that anthropogenic (human-caused) global warming (AGW) is a hoax.

I'd seen many of the references before. They ranged from irrelevant to bad science. Some I honestly don't have the expertise to evaluate. But I owe it to my scientific background to evaluate the case with a skeptical eye.

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