According to this article, rich countries previously agreed to pay $100 billion annually to poor countries to slow down climate change. The rich countries haven't made those payments. And now South Africa estimates that the annual bill is $750 billion.
I haven't seen what the current politicians in the US think we should pay. We can't even get money to keep our bridges from falling in. I bet lots of people would bitch almighty about paying other countries. But it seems fair that the US and other rich countries - who caused all the problems to begin with - should pay poorer countries to avoid the same practices that we did.