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STICKING TO CLIMATE SCIENCE As an undergraduate physics major in the mid-1980s at the University of California, Berkeley, I knew about Richard Muller--the physics professor who was the subject of Michael D. Lemonick’s interview, “‘ I Stick to the Science ’”--and his controversial theory that a “death star” was responsible for major mass extinctions. Later, as a graduate student studying climate, I became aware of Muller’s work attempting to overthrow the traditional Earth orbital theory of the ice ages--that, too, didn’t pan out

Editor's note: The following is a response by climatologist Michael E. Mann to a Q&A article that appeared in the June 2011 issue of Scientific American , which became available to readers in May. Last month, Scientific American ran a disappointing interview by Michael Lemonick of controversial retired University of California, Berkeley, physics professor Richard Muller.