4th (of d six) global warming skeptic who changed his mind

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Michael Shermer, publisher of Skeptic Magazine

In 2001, Shermer hosted a Skeptics Society debate on global warming, prompted by Lomborg’s Skeptical Environmentalist. He sided, predictably, with the skeptics. Then he looked at the science, and in 2006 reached a “flipping point,” acknowledging the “overwhelming evidence for anthropogenic global warming.”
Before quote: “Scientists like Bjorn Lomborg in The Skeptical Environmentalist have, in my opinion, properly nailed environmental extremists for these exaggerated scenarios.” (2008, referring to 2001)
After quote: “Because of the complexity of the problem, environmental skepticism was once tenable. No longer. It is time to flip from skepticism to activism.” (2006)

1st (of d six) global warming skeptic who changed his mind

Cover of "The Skeptical Environmentalist:...

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Bjorn Lomborg, Danish academic
Lomborg made waves with his 2001 book, The Skeptical Environmentalist, which argued that global warming was no big deal, and fighting it would be a waste of money. This month, he’s publishing Smart Solutions to Climate Change, which argues that a global carbon tax should be imposed to raise $150 billion a year to address global warming.
Before quote: “In 20 years’ time, we’ll look back and wonder why we worried so much.” (2002)
After quote: “We actually have only one option: we all need to start seriously focusing, right now, on the most effective ways to fix global warming.” (2010)