Good point. But one factor is China is also greatly reducing their emissions. For instance, their pollution levels have plummeted after enacting strict controls:

https://epic.uchicago.edu/insights/china-has-quickly-and-sha...

Still, that is a good point, a lot of the emissions from manufacturing have been shifted to other countries.

> US consumers and businesses buy almost all their stuff from China

This is not really the case, China is the US' #3 trading partner, and trade-corrected GHGs are also down (see the graph further down the page), actually by an slightly better percentage off-peak.

China’s massive coal footprint is shrinking due to successful, intentional effort under the most recent five year plan, and coal’s presence in China’s power mix will likely continue to shrink, while China ramps up exports of clean energy technology to the rest of the world.

The trend has China installing as much solar capacity as the rest of the world combined every single year within a reasonably small margin.