That's because you're reading about different 'points of no return'. Originally, we were trying to keep the world as we knew it. There was a big push for 'abs

That's because you're reading about different 'points of no return'. Originally, we were trying to keep the world as we knew it. There was a big push for 'absolutely no more than 350 ppm!'. That came and went. Then it was '1.5c', or a world that looks vaguely as healthy as what we have now, but every scientist who's actually done the research knows this is a pipe dream'. Year by year, we're slowly dooming ourselves to a worse and worse fate. It's still worthwhile to act, because things can always get worse. What happens when Pakistan and India are nuclear armed nations each others throats over water rights to the Indus river? Nobody says 'game over' because that's not helpful. It can always get worse, and hope and action is the only way it ever gets better.