A scientist known for his skepticism over climate change released a new study this month with surprising results. UC Berkeley astrophysicist Richard Muller and a team of other scientists recently set out to test whether measurements of Earth's temperature are too flawed to show that the Earth is warming. The analysis of more than 1.6 billion temperature measurements led him to write in a recent op-ed in the Wall Street Journal, "You should not be a skeptic, at least not any longer. Global warming is real." Muller is a complicated character, writes Andrew Revkin in the Dot Earth blog for the New York Times.