Yes, there isn't a clear divide between "first-world" and everyone else anymore. That being said, I think the wealthier countries that are more industrialized have a debt to pay with regards to climate impact given that they were able to develop and build before mainstream awareness of the issue, and virtually all of the accumulated pollution today is therefore due to these industrialized nations.

I'd like to see a period in which China, India, and smaller nations are able to use more than their share of the global quota while the wealthier countries in western Europe and North America use less, per capita and in sum.