Is there any evidence of the sky falling? Ocean levels are the same, seasons come and go, no mass migrations other than people just wanting to leave their socialist hell holes, etc. Not one dead polar bear to show as proof that anything is going amiss in nature.
Since when does the Left care about evidence unless it "proves" their position? The real issue is that the Covid narrative has imploded and the Left needs another lynchpin to drive their "Great Reset" forward, so it's back to the basics.
Climate Change is perfect for the Left since there is no hard evidence that it even exists outside the normal radiation energy patterns of the Sun so they can invent whatever "evidence" they need to destroy capitalism.