Think about it like this: one of the main reasons colossal animals like dinosaurs were able to exist back in the day but not now is because the oxygen levels in our atmosphere were higher, which was required for the muscles of those large animals. When oxygen levels dropped over time, large animals became too sluggish for their size and died off.

By pumping all the crap that used to be in our atmosphere back into it, we set our atmosphere back to dinosaur times, which you could almost think of as healthy for living things in an abstract way.
Even if we lose florida and the netherlands we were going to lose them anyways because CO2 levels would still be rising naturally anyways