Sustainability "I Stick to Science": A Climate Researcher's Unexpected Congressional Testimony Why Richard A. Muller wouldn't tell House climate skeptics what they wanted to hear By Michael D. Lemonick THIS IS A PREVIEW. Buy this digital issue or subscribe to access the full article. Already a subscriber or purchased this issue? Sign In Photograph by Timothy Archibald Richard A. Muller has never been comfortable with conventional scientific wisdom. In the 1980s, when his mentor Luis Alvarez came up with the then outrageous idea that a giant comet or asteroid impact wiped out the dinosaurs, the University of California, Berkeley, physicist went him one better, suggesting that the meteorite had been hurled our way by a dim companion star to the sun, which Muller dubbed Nemesis. In the 1990s he posited that ice ages are triggered by space debris encountered because of cyclical changes in the location of Earth’s orbit. More recently, Muller called Al Gore’s An Inconvenient Truth a pack of half-truths and asserted that measurements of global temperature rises are deeply flawed, insisting that many of those who warn of climate change have sold the public a bill of goods. Although he is convinced that climate change is real, potentially dangerous and probably caused in part by humans, he has taken climate scientists to task for ignoring criticisms by outsiders, including meteorologist Anthony Watts of the Watts Up with That? blog and statistician Steve McIntyre of the Climate Audit blog. Along with several colleagues, Muller started the Berkeley Earth Surface Temperature (BEST) project to rectify what he saw as the flaws in existing measurements of global warming. THIS IS A PREVIEW. Buy this digital issue or subscribe to access the full article. Already a subscriber or purchased this issue? Sign In Buy Digital Issue $7.99 Add To Cart Print + DigitalAll Access $99.99 Subscribe ADVERTISEMENT Scientific American is a trademark of Scientific American, Inc., used with permission © 2015 Scientific American, a Division of Nature America, Inc. All Rights Reserved.