In all fairness probably only one or two of them actually believe their own bull crap. They just know from their focus groups this is what they need to tell their lunatic base if they want to win their primaries.
It’s worth noting that AOC only jumped on this “Green New Deal” bandwagon AFTER she was elected. She represents a crummy district in NYC that is 50% Hispanic, and where most people don’t give a damn about “climate change.”