[danaris]

I'm not sure if this would actually count as "existential", but I think that it's well worth being very, very concerned about a consequence on the order of

"Millions to billions of people die; large percentages of the rest are displaced and/or have their lives made significantly shorter, harsher, and less certain as war, famine, disease, and natural disasters become vastly more common around the globe."

And there's really very little question that that's where climate change is leading if we don't get it under control soon.