The best for the Earth - no, the Earth doesn’t care, the best for the fauna would be if humans controlled and shut down all nuclear power plants, then turned off all electrical installations and then dropped dead. But that will not happen.
The best for future generations would be if we finally got off our lazy asses and forgot our selfish attitude. If EVERYONE contributed their little part, that would already help a lot. But that won’t happen, let’s not kid ourselves. Our children will get the bill, sometimes when I see everything completely black, I blame myself for having been so selfish as to want to have a child. It will not have it any easier than we do, and who knows what awaits us in old age.
Apart from that, we don’t even need to look at the abstract climate. It’s enough to look at the “social” system, to which I count all professions involving people. It starts with the lousy, underground and underpaid working conditions of educators, caregivers and all hospital staff. I’m far from thinking socialism in extreme forms is good, in my opinion that leads to nothing, but in this extremely profit-maximized system in which we live, that’s obviously not good either – for no one except those who have money in abundance. And even they will eventually realize that they can’t buy everything.
I’m digressing – I just wanted to point out that probably not enough people will be reached to change enough in time. Even on a small scale that doesn’t work, so how should it be enough on a large scale to really make a difference.