We must limit the problem, then adapt and mitigate. Some damage is irreversible, it does not mean that it’s a good idea to stop trying to understand what will happen. You don’t stop weather forecasts when a hurricane touches land just because it’s going to happen anyway.
Reality is not binary. There’s a whole spectrum of situations between "everything gets back to normal and all is well" (which was never on the cards after the 1980s) and "all humans die within a century". And the nuances in between still affect billions of people.
