pale
What you wrote is really worth so many replies, and I feel bad for not checking back to see your awesome answer earlier. You have some great ideas there. Also, I was delighted to see that obviously you share my impression that reducing the size of human population would be a way to help solve a lot of problems - but there's really no way to do that but through education... (or natural disasters and disease, but than, that's not an option, right?)
My vision / lifelong dream would be to have some huge property and build a
combined orphanage / boarding school / animal sanctuary. When I explained that to a friend once, he answered "like the 'Xavier's School for Gifted Youngsters' from X-men?". Yes, just subtract the superpowers and add the animals.

[Animals are good for children. They learn to care for another being but themselves, and it even is good for their immune defense.]
Then, I would take orphans from all countries to live and be educated in that school - not only on school subjects but also things like protection of nature, ethics, animal welfare etc. And every child could choose one of the rescued animals to be "theirs", thus winning a true and unconditionally loyal friend. And there would be musical instruments and utensils of art ready for every child to use as they wish. And a forest, with huge trees and rivers and horseback riding opportunities and lessons on herbs and trees and ... you get the point.
And when picking the children in the first place, I would try to judge their talent as well as character.
But the graduation from that school would definitely include not only a certificate of their knowledge, but also a testimony of personality!
And they would be allowed to sleep in whatever rhythm they choose (being diurnal or nocturnal), dress however they like to dress (there might be a color code for school time though), be / live outside whenever they wish to (I would not force them to cope with stone walls around them if they don't like it) and believe in whatever they like to believe in - as long as they harm no other ("my freedom ends where your freedom begins").
Ah, there's so much more to that dream than I can write here... and it get's me daydreaming too much every time I think of it...
But the above is a dream that really IS possible with enough money. Just that I won't ever have enough for that...
If every multimillionaire in the world founded a school like that, I think it would have a huge impact on society.