[user104658]

I'm not going to comment on whether or not I think the "point of no return" is correct but I feel like I have to point out the hilarious/awful level of reading comprehension required to read that tweet and think it means that the world is supposed to have ended already .

The tweet, quite clearly, says that if we don't stop using fossil fuels the world will be doomed by eventual climate change. It quite clearly does NOT say that the world will have ended within 5 years.

The concept is that there's a "point of no return" beyond which we may no longer be able to avert eventual climate catastrophe.

That may or may not have occurred. There's really no way to tell and I doubt there ever will be a way to tell when that point was, because the human race isn't going to do **** to avert it. Ever.