Mark Tapscott of the Washington Examiner tells the sad tale of a progressive who dared to question the global warming orthodoxy.

America is rapidly becoming a First Amendment-free zone, thanks to the growing power of the PC police in the media and on campus and among Big Green environmentalists in the nonprofit community.

American University adjunct professor and veteran self-described “progressive activist” Caleb Rossiter is the latest victim, thanks to an article he wrote for the Wall Street Journal opinion pages questioning global warming.

Rossiter’s sin was describing global warming as an “unproved science” and advocating that developing African nations be allowed to adopt the same “all-of-the-above” energy policies as the U.S. follows.

Rossiter’s reward was to be terminated as an associate fellow by the Institute for Policy Studies. Despite his 23-year relationship with IPS, Rossiter was fired via email.

“I have tried to get them to discuss and explain their rejection of my analysis,’ Rossiter told Climate Depot’s Marc Morano, who broke the story last week.

“When I countered a claim of ‘rapidly accelerating’ temperature change with the [UN] IPCC’s own data’, showing the nearly 20-year temperature pause — the best response I ever got was ‘Caleb, I don’t have time for this,’” Rossiter said.