Earlier quoted context omitted.
Yes, but that shouldn't prevent us from implementing it where we can first.
Not if all your efforts are wasted because other nations won't follow in-step or do not care. This isn't grade school were trying your hardest gets you an 'A' for the day... in reality trying your hardest and failing is still failure. The US could do all the magical things and net zero emissions next year and it won't matter one bit. That's just reality... without a globally concerted effort, it's all just waste. But…
https://www.eesi.org/articles/view/u.s.-leads-in-greenhouse-...