RE:3000 rich people and GretaClimate change has become the go-to issue for these grifters. It is the modern day doomsday preacher and has about the same empirical evidence (which is to say none). It is an intangible vaugue threat which can never be prover or disproven at any time.
All they offer is fear but will sell you indulgences (tax) to ward off the climate armageddon. Too many governments join this cabal of charlatans driven by their lust to control other people and their own financial gain (obviously).