The fear that the Earth faces an unprecedented threat from “human-induced climate change” has become an article of faith among the chattering classes. Open dialogue has all-but disappeared, as even professional societies succumb to groupthink. Scientists who stray from the so-called “consensus” are subjected to professional censure. One is Alberta’s Allan MacRae, who had the temerity to write about the damage done to humanity and the environment by radical greens. “The takeover of environmental institutions by extremists is now almost complete,” write Tom Harris and Dr. Jay Lehr on PJ Media, and truth is only one of the victims.