Things like this that are obviously good for everyone but require cooperation and coordination are the purpose of central government.
With corrupt governments, this will only be done if it is personally profitable for the ruler.
Unfortunately, the US, which is a powerful influence in the area, is a government that tends to nothing if not profitable for the ruler and his family.
Yes, the rulers and their families. What's good for the families is by extension good for the ruler. I'm not sure it was a needed "fix"?
I'm also not sure that us all living like people who are not indigenous to places like Europe, China, or India actually results in a better world, though I do agree that it's one without anthropic climate change.
You're imagining a state that's stable but not one connectable to the present day. We need central government because of the way things are, not because of the way they could be in an arbitrary reimagining of the world.
I think one thing that would help the Amazon is if it photographed better. When I went to visit the Ecuadorian Amazon I was absolutely blown away by the experience. But the photos really aren’t that compelling. Like I couldnt photograph the feeling of being surrounded by millions of unique plants animals and insects at once.
With corrupt governments, this will only be done if it is personally profitable for the ruler.
Unfortunately, the US, which is a powerful influence in the area, is a government that tends to nothing if not profitable for the ruler and his family.