besides toomuchtodo's nicely made argument, I would like to point that that many "major" nations (I'm assuming that refers to mostly western countries, correct me if I'm wrong) were able to focus on committing to emissions because they gave their dirty work (ie: mass manufacturing, waste disposal, resource extraction) to other countries, especially China.

toomuchtodo's arugments are deluded and ill respond to those in a bit. But I want to be clear that no one "gave" their dirty work to china. Industry in all these countries were priced out.

The Western and Asian governments increased environmental regulations and the cost to do business rose. In China the government ignored its climate obligations and slashed environmental regulations and increased coal investment to drive energy costs down and thus the manufacturing moved there. You think Germany couldnt have cut environmental regulations slapped down a few coal plants and made solar panels?

Thats why there was climate meetings to get everyone on the same track. If everyone is aligned in their goals then the economic hurt is easier to bare. China intentionally captialised on this and I do not think they deserve any praise for it.