"Despite the large total of CO2 imports and exports, US emissions are only 6% higher and Chinese emissions are 13% lower when CO2 transfers are taken into account." Energy related carbon dioxide emissions peaked in 2007 in the United States [1]. They didn't just get hidden by imports replacing domestic manufacturing. Even incorporating imports into the national balance, US emissions are down from the peak. This is largely due to efficient combined cycle gas turbines replacing coal plants and -- to a lesser but growing extent -- a larger proportion of renewable electricity in the national electricity mix. Chinese carbon dioxide emissions have not peaked yet.

As of 2017 (referenced above), 87% of Chinese emissions are attributable to domestic consumption. That should moderate hopes that Chinese emission trends could be reversed by CO2 tariffs. It should also moderate anxiety that Chinese emissions are "really" the offshored emissions of Western consumers.

[1] https://en.wikipedia.org/wiki/Greenhouse_gas_emissions_by_th...

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