You might be seeing a glimmer of light at the end of the tunnel. Watch to see if any of them become embarrassed over their earlier enthusiasm. If so, I suggest cultivating it. When the AGW believers hit that tipping point, AGW will fade into the sunlight like goldfish swallowing (1930s) or stuffing as many people as you can in a phone booth (1960s?)
But only to be replaced by...
Liberals always need a meta-threat to foist their elite control over us.