the first paragraph is exactly “the law of the jungle” aka how other animals behave - it couldn’t have been the difference, since it’s the same. and then this extended to less tangible things
so it seems you agree, but you don’t realise it: humans are unique because they don’t follow this rule.
i read a book back when i was religious about the “temptation for good”, which the author argued was the proof for the existence of god, but i think it’s what made us different
it might be just me, but i feel bad for not helping people (i mean like beggars and the like), but the world has conditioned me that it’s a bad idea - you’ll get screwed over, you won’t have stuff, etc.

as to climate change - there are many people spending billions of dollars and countless hours to make sure the average person doesn’t get to or doesn’t feel motivated to do anything, i don’t think it’s “natural” behaviour

history seems to forget that cuba exists, despite the fact that most of the world (especially the cia) trying to destroy it for more than half of a century
not that i’m saying cuba is a utopia, but they managed to survive and keep their more equitable system, again, despite constant assassination attempts and decades long embargoes

what is “the same trait within that led to our wild success as species number 1”?

i think the thing that made the difference was helping the “less fit” so that they could keep and transfer knowledge, do thinking and make tools