Who told you that the world is fragile? You’ve just devoured the claims of the climatologists – the same ones who predicted Armageddon when i was a kid, who said that by now there wouldn’t be coastal civilizations, etc.
Hashem runs the world through teva, but it is not our physical actions that change the world in teva – according to teva statistics in the 80s, the world’s population should not have anything to eat…but ma asah Hkb”h? He made more food available. The answer then wasn’t to, chas veshalom, listen to the statisticians and have less children.
We don’t have bechira to affect anyone else, let alone the world itself. That would undermine hashgocha. Perhaps wastefulness is an act of ingratitude, which itself might cause less bracha in the world as punishment for that sin, but the final outcome is totally bidei shomayim.
The fact that Hashem running the world and that our bechira doesn’t have independent consequences is “ridiculous” to you, only shows how much little you and almost everyone else here have been exposed to basic jewish hashkofa. I’m not saying any big chidushim here.