"I lost a finger, the damage has already been done. No need saving my arm, you can go ahead and cut it".
Unless you meant "Damage has already been done, there is a lot we won't get back. And that's exactly why we should now fight to preserve what we can"?
> Unfortunately, even if we exceed and then bring temperature back to 1.5 degree over preindustrial, the damage has already been done.
We won't be able to get back to 1.5, and in fact the way it's going we're still accelerating our emissions, so it will get a lot worse.
Now, if we could get back to 1.5, it would most definitely be better than not getting back to it. So "the damage has already been done" is wrong.
If we managed to keep it at 2 instead of higher, it would most definitely be better than not keeping it at 2. So "the damage has already been done" is wrong.
If we managed to keep it at 3 instead of higher, ... you get my point.
What's happening is that we've already caused damage that will hurt, and we are now actively working towards causing more damage that will hurt more. The faster we get our shit together, the less it will hurt. There is no "it's too late, it's done". There is "it will be painful" and "it will be more painful" and "it will be a lot more painful" all the way down.
"The urgent task is to ensure that global warming remains below the 2°C threshold, with the aim of returning to 1.5°C by the end of the century."
I disagree it's impossible but I agree it is difficult, and (as I said) the damage will be done.
Nope. "damage" will be done. "The damage" implies "all of it", and that is wrong. Going back to 1.5 actually means less damage than not going back. So "the damage" is not "completely" done.
That's a different claim, but also no. Let's imagine we go 1.5 -> 2 -> 1.5 in a few decades (and keep in mind capture is more difficult, so the 2nd transition will take longer), compared to just 1.5 -> 2. In the return case, we stress all the ecosystems twice by change, rather than once. So it's not at all clear it's less damaging.
Are you just making this up?
I am not saying I have all the answers, I am just not convinced that "returning" is strictly better option.
It's not "just" that people will go to the beach more in the north during their holidays, you do realise that?