When Alex Bozmoski was in college, he didn’t believe climate change was real. He was “a very active conservative Republican,” he says, who “loved making noise.” In high school, he started a newspaper called The Right Idea; the logo was an eagle gripping a Christian cross. And at Georgetown University, after George W. Bush won the election in 2004, he carried a cardboard cutout of the president around campus until he was tackled by a liberal student and Bush was broken in half.

So when Bozmoski enrolled in a climate science class taught by Nathan Hultman, his primary goal was to heckle the professor. But every time he brought up something he had heard on a conservative radio talk show, Hultman asked him to back up those claims with actual scientific evidence. Soon, Bozmoski realized climate skepticism was unfounded, and that climate change is a very serious issue that his own political party was completely ignoring.

“I felt alienated that my tribe has been so out of the loop and not even working on it,” Bozmoski says. “To me, it seemed like just an easy way out, like a coping mechanism more than a governing strategy.”

So a few years after his college graduation, Bozmoski began traveling around the country, speaking to conservatives about climate change and free-market options to tackle it. He visited church groups, federalist societies, chambers of commerce, universities — alone or together with Bob Inglis, a former Republican congressman who introduced a bill to tax carbon emissions. (Inglis’ views on climate change cost him his House seat in 2010.) As Bozmoski did more of these talks, he says, “it became pretty clear that when people heard from us, a lot of conservatives were very motivated to get involved.”