I've always found it fascinating that folks accuse China of generating the most greenhouse gasses and while yes by absolute number of people they probably do that's the worst interpretation of statistics ever. China has a LOT of people, if you believe in equality everyone should have the same chance at the standard of living as everyone else. The problem is that we're a very rich country, so per capita alone we generate per person more emissions than a typical Chinese citizen. We use more resources than a typical counterpart in China. (A lot of the stuff that China produces is sold to us.) and so on. It's like a billionaire asking why they can pay a tax of a 1/2 million dollars as pocket change while that would financially bankrupt the average citizen. As the leading country and the wealthiest we need to contribute a bigger share because it will technically hurt us per person less. If we don't how would we expect someone who might not be able to contribute without literally dying to give up a part of their share?
And it is a problem. Climate change is likely to hit poorer countries first, and when conditions are unsustainable, who's door do you think they'll come knocking on first? If you're the one with all the food and everyone else is starving to death, it doesn't matter if you're armed, you're in deep trouble if you don't share. And it's not like we can't share, we do actually have enough for everyone. It's just, it's hard to give up luxury.