Agreed. We simply have been functioning off the premise that what we do has no impact. But we are in the billions now and most of what we do we do at a huge and unimaginable scale.
Nature could, before, take time to heal and "absorb" everything we threw it's way. Time was the ultimate healer.
We no longer have that option and we simply must stop the third world from progressing. If you all thought it was bad with the small 1st world population damaging the env, you can't even fathom the scale and sheer trash the third world billions will generate in the coming decades whilst they "come out of poverty and industrialization".
All the more reason why we should be uplifting the third world. Instead of allowing them to proliferate their own suffering using debt and population booms.
Wouldn't that be imposing cultural values of the first world on developing countries?
What makes us sure that modernity as it is now is that much better? I'm not entirely convinced that is the case, and there are many problems that result from problems inherent to modernity.
Given the mental health crises in the first world from our youth, I think the first world is far, far from figuring everything out, including problems with suffering.
As far as debt, isn't that a first world problem saddled onto the third world?
Finally, as a thought experiment, if an alien species from outer space came down here and wanted to uplift America, would Americans want it? I bet you, people would not take it well. There's a presumption of cultural and technological superiority that will chafe everyone. I've seen memes comparing Star Trek as an ideal of where we can go as a civilization, and yet, Star Trek also talks about the Prime Directive, not uplifting ... unless violating it generate enough drama to have an interesting plot.
I think the ultimate lesson will be "we're one with the environment, not, in fact, a separate entity from it".