The atmosphere also doesn't care which governments are involved, or who is "leading". We need all the emissions to stop, this announcement is about 7.5% of the total which is quite significant. 12 more of those and we're done.
I thought China and India were still increasing quite rapidly (I could be wrong). Unless they start going the other way, that 7% will be less than the growth from others, so no closer to 0 globally.