They have no positive agenda. They do not have any ideas about how to improve society. So they instead prefer the idea of a huge crisis that only they can save us from.
"Science" has nothing to do with it. Green claims are a quest for power, against democracy.
But we should reject the idea that climate change *requires* the suspension of democratic politics and the forced reduction of people's expectations. We should see that as ideological.
The most ecologically damaging thing possible is austerity. It forces people to raid the natural environment for resources -- fuel & food. Abundance allows people to demand better management and protection of the environment.
We are *less* vulnerable to climate change now than then.
And it is facts that should make us sceptical of environmentalism.
It is a fact that greens love the idea of rationing, even though there is no rational basis for it.
It is therefore a fact that austerity is green ideology, not science.
End.