Calvin and Hobbes explain why Climate Change alarmists are almost invariably rabid about it

From the strip first published on 7/7/1995:

Enmity sells

From a Calvin and Hobbes search engine:

Script
I’m writing a fund-raising letter. The secret to getting donations is to depict everyone who disagrees with you as the enemy. Then you explain how they’re systematically working to destroy everything you hold dear. It’s a war of values! Rational discussion is hopeless! Compromise is unthinkable! Our only hope is well-funded antagonism, so we need your money to keep up the fight! How cynically unconstructive. Enmity sells.

Description
Calvin is writing a fund-raising letter. He tells Hobbes the secret is to depict everyone who disagrees with you as the enemy. You explain how they’re destroying everything you hold dear. It’s a war of values. Rational discussion is hopeless. We need your money to keep up the fight. Hobbes says that’s cynically unconstructive. Calvin informs him that enmity sells.