In a piece titled, “The Conversion of a Climate-Change Skeptic,” Richard A. Muller, a University of California, Berkley physicist who founded the Berkley Earth Surface Temperature study (BEST) wrote that his, “total turnaround, in such a short time,” was driven by a new report from the group that concluded for the first time that global warming is a man-made problem. That revelation brings Muller essentially full circle from his stance a few years ago, when he criticized other global warming studies as flawed and questioned whether the Earth was even warming abnormally, dangerously fast at all.

“Science is that narrow realm of knowledge that, in principle, is universally accepted,” Muller wrote. “I embarked on this analysis to answer questions that, to my mind, had not been answered.