Climate-Change Scientist Cleared in Closing of U.S. Data-Altering Inquiry - Bloomberg

“It certainly closes the books on Michael Mann and the e- mails,” Joe Romm, a blogger for the Center for American Progress, an advocacy group with ties to President Barack Obama’s administration, said in an interview. “They found nothing wrong with the science, or any evidence that there was anything wrong with how the scientists went about their work.”
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Mann was lead author of the first reconstruction of North American warming going back 1,000 years, which showed recent temperatures increasing sharply. The 1998 findings have been confirmed by several studies, Mann said.

“The way you get ahead in science is by proving the other guys wrong,” Mann said. “There is literally no study in the peer-reviewed scientific literature that contradicts our original conclusion.”

Richard Littlemore | National Science Foundation vindicates Michael Mann

Carbon steel "hockey stick" stronger than ever
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The result? No shred of evidence exists to impugn Mann's work.

As Romm points out, the central conclusion drawn from the Hockey Stick - that temperatures, stable for a thousand years, have spiked dramatically since humans began using fossil fuels - is also being confirmed with each new study. It appears that, unless you are willfully blind or directly in the employ of the fossil fuel industry, the evidence - of climate change, as well as of Mann's scientific bona fides - is undeniable.
...The Hockey Stick is unbroken.