Some climate change skeptics have changed their positions regarding global warming. Ronald Bailey, author of Global Warming and Other Eco-Myths (published in 2002), stated in 2005, “Anyone still holding onto the idea that there is no global warming ought to hang it up.”[308] By 2007, he wrote “Details like sea level rise will continue to be debated by researchers, but if the debate over whether or not humanity is contributing to global warming wasn’t over before, it is now… as the new IPCC Summary makes clear, climate change Pollyannaism is no longer looking very tenable.”[309]
Jerry Taylor promoted climate denialism for 20 years as former staff director for the energy and environment task force at the American Legislative Exchange Council (ALEC) and former vice president of the Cato Institute. Taylor began to change his mind after climate scientist James Hansen challenged him to reread some Senate testimony. He became President of the Niskanen Center in 2014, where he is involved in turning climate skeptics into climate activists, and making the business case for climate action.[310][311][312]
Michael Shermer, the publisher of Skeptic magazine, reached a tipping point in 2006 as a result of his increasing familiarity with scientific evidence, and decided there was “overwhelming evidence for anthropogenic global warming”. Journalist Gregg Easterbrook, an early skeptic of climate change who authored the influential book A Moment on the Earth, also changed his mind in 2006, and wrote an essay titled “Case Closed: The Debate About Global Warming is Over”.[313] In 2006, he stated, “based on the data I’m now switching sides regarding global warming, from skeptic to convert.”[314]
In 2009, Russian president Dmitri Medvedev expressed his opinion that climate change was “some kind of tricky campaign made up by some commercial structures to promote their business projects”. After the devastating 2010 Russian wildfires damaged agriculture and left Moscow choking in smoke, Medvedev commented, “Unfortunately, what is happening now in our central regions is evidence of this global climate change.”[313]
Bob Inglis, a former US representative for South Carolina, changed his mind in around 2010 after appeals from his son on his environmental positions, and after spending time with climate scientist Scott Heron studying coral bleaching in the Great Barrier Reef.[315]
Richard A. Muller, professor of physics at the University of California, Berkeley, and the co-founder of the Berkeley Earth Surface Temperature project, funded by Charles Koch Charitable Foundation, had been a prominent critic of prevailing climate science. In 2011, he stated that “following an intensive research effort involving a dozen scientists, I concluded that global warming was real and that the prior estimates of the rate of warming were correct. I’m now going a step further: Humans are almost entirely the cause.”[316]
“I used to be a climate-change skeptic”, conservative columnist Max Boot admitted in 2018, one who believed that “the science was inconclusive” and that worry was “overblown”. Now, he says, referencing the Fourth National Climate Assessment, “the scientific consensus is so clear and convincing.”[317]