Climate Change Skeptic Does 180 On Global Warming

""Humans are almost entirely the cause" of climate change, according to a scientist who once doubted that global warming even existed. Last year, Richard Muller walked back years of climate change skepticism in light of new research. But Sunday's comments go one step further. Muller wrote in an NYT op-ed that after exhaustive research, he believes that an increase of greenhouse gases can be clo ...