Dismissing a person's anxiety about existential threats is also unhelpful. As if u/halfjoking has more responsibility, agency, culpability than the actual villians.

True, a return to Eocene-like conditions (iirc atmospheric methane 200ppm) is unlikely. (On mobile; too lazy to find tidbit that rules out calthrate gun hypothesis.)

But there are plenty of existential threats. As well as compounding factors interacting in unforeseeable ways.

In other words, please be nicer. Shit's bad, getting a lot worse, and people are (understandably) freaking out.