American University professor Caleb Rossiter used to believe in global warming, but when he changed his mind, he lost his position at the Institute for Policy Studies.

Dominic Lynch has an exclusive report at the College Fix.

EXCLUSIVE: Prof Fired For Calling Global Warming ‘Unproved Science’ Stands Firm

If one would have asked statistician Caleb Rossiter a decade ago about global warming, he says he would have given the same answer that President Barack Obama offered at a recent commencement address.

“He castigated people who don’t believe in climate catastrophe as some sort of major fools,” Rossiter says of the president’s speech, adding he would have agreed with the president – back then.

But Rossiter would give a different answer today.

“I am simply someone who became convinced that the claims of certainty about the cause of the warming and the effect of the warming were tremendously and irresponsibly overblown,” he said in an exclusive interview Tuesday with The College Fix. “I am not someone who says there wasn’t warming and it doesn’t have an effect, I just cannot figure out why so many people believe that it is a catastrophic threat to our society and to Africa.”

For this belief – based in a decade’s worth of statistical research and analysis on climate change data – Rossiter was recently terminated as an associate fellow at the Institute for Policy Studies, a progressive Washington D.C. think tank.

Rossiter wrote an op-ed for The Wall Street Journal titled “Sacrificing Africa for Climate Change,” in which he called notions of climate catastrophe “unproved science,” and shortly thereafter received word from the institute that his position was terminated.

“Unfortunately, we now feel that your views on key issues, including climate science, climate justice, and many aspects of US policy to Africa, diverge so significantly from ours,” their note to Rossiter stated.