"They Have Three Or Four Times The Amount Of People The U.S. Does." has nothing to do with that they are a part of the equation that you have very little control over.
As I've already pretty clearly stated, the US needs to address our piece of the puzzle right around "Last Week".
That does not change that there is a bigger picture causing damage that we are a single part of. If we could hit a magical button that made the US a county that contributes nothing to climate change next week, there would still be damage happening that folks seem to want to shrug off with "Well, they've got more people!"