Why do you have this notion that Western Countries must be perpetually paying up to clean the mess non Western countries do?
P.S. My country has been planting vast areas of forest since the 13th century for economic purposes. Not sure what you mean by "Everyone else has had the luxury of exploiting their land", since here (and in most of the EU) we have vast areas of forest and actually took care of them.
I can even accept that richer countries could pay somewhat more. But, still, there are a lot of non-western countries that are quite rich. So, why only western countries should pay?