> Cleaning up the US would probably mean outsourcing more carbon emissions to the rest of the world.
That's like saying that cleaning my house means moving the dirt to somebody else's house.
> There is no other way.
That is not true. The other ways are:
1. Reduction of energy use per person.
2. Control of population growth - at the very least, stabilizing the Earth's population and theoretically a reduction.
3. Using Energy sources which are low-carbon, but expensive and/or difficult to deploy.
of course your way makes it a lot _easier_, but since reduction of greenhouse gasses is necessary regardless of the availability of a convenient energy solution, these are also relevant, and gradually are becoming necessary.
By the way - (1.) is already progressing relatively well in lots and lots of countries.