For two years, the mystery has endured: who set out to undercut climate scientists by publishing more than 1,000 of their private e-mails on the Internet?

The original e-mails, released in 2009 on the eve of a high-stakes United Nations climate conference in Copenhagen, sowed doubts about the scientists’ research and integrity and galvanized skeptics who challenge the scientific consensus that global warming is under way. It set off six separate official inquiries, all of which cleared the researchers of scientific misconduct.

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