Why could any of those countries not make the same argument, saying all other countries + the US pollute a lot more than them therefore thats not really their business ?
Not sure if you replied to the wrong person, but that's certainly not anything I said. I was responding to someone that wrote "99% of climate change effort is social signaling, the other 1% is engineers and scientists working on more efficient, cleaner technologies". If you make green technology cheaper, then those technologies will be adopted in the countries I listed. And the most effective way to reduce them in those countries is to make green alternatives cheaper. You're not going to accomplish much if you focus exclusively on reducing US GHG emissions.