Charles Krauthammer says it right up front in his Washington Post column: “I’m not a global warming believer. I’m not a global warming denier.”

He does, however, challenge the notion that the science on climate change is settled and says those who insist otherwise are engaged in “a crude attempt to silence critics and delegitimize debate.”

How ironic, then, that some environmental activists launched a petition urging the Post not to publish Krauthammer’s column on Friday.

Their response to opinions they disagree with is to suppress the speech.

There is no debate. Climate change is real. And, yes, we are, in part, to blame. There is a 97% consensus among scientific experts that humans are causing global warming. Ninety-seven percent! Yet some very vocal Americans continue to debate what is surely fact.

I repeat: I’m not a global warming believer. I’m not a global warming denier. I’ve long believed that it cannot be good for humanity to be spewing tons of carbon dioxide into the atmosphere. I also believe that those scientists who pretend to know exactly what this will cause in 20, 30 or 50 years are white-coated propagandists.