It's this type of morality and ethics I think that is the reason America is quickly becoming a failed state.
You are correct that we are ahead of many other countries and that they will more than swamp our emissions. BUT the last 150 years worth of climate impact from emissions comes largely from the US and western Europe. So we have a responsibility and we are (or were at some point) leaders in the world. If we don't do something how do we expect others to do something???
China, for all it's evil, isn't responsible for most of the emissions that have accumulated over the last 150 years. WE ARE.
By your version of ethics we just behave as badly as the worst person in the room and call it a day. That's wrong.
The other thing you folks always do while demonizing China and India: you forget who is responsible for their industry having a market. It's US ALL DAY LONG. WE buy the Chinese goods. In fact our entire corporate structure shifted to China to get goods manufactured because WE wanted it cheaper.
So if you want to look at who the problem is: look in the mirror. It's us. It's always been us. And it will continue to be us.
We will stop using China the minute China starts behaving like a civilized country with good environmental stewardship and care for their people. Why do you think more and more industry is looking to Indonesia and other places in SE Asia? Because China is developing a middle class who don't want to live in the shadow of being our lackeys.