The next question is how would you even begin to evaluate the impact of changes made by man.
First you would need to start with a climate model that works.
They don’t have one.
Game, set, match.
If they had a climate model that worked, they could initialize it to the conditions of 1918, run a 100-year prediction, and have it match the recorded observations of the last 100 years.
If they could do that, they would have, and they’d be shouting it from the rooftops.
They aren’t, which means they haven’t, which means they can’t, which means they don’t.
Agreed, but an even more fundamental question is:
What is the ideal climate? Is it the climate that exists everywhere on earth today? Or is it the climate from 30 years ago?
Or from 10,000 years ago when there was a mile of ice on top of us? (Ice climbers and skiers might argue THAT is their ideal climate!)