A new study by Chris Weber et al. estimates that up to a third of China's CO2 emissions are embodied in exports. The emissions calculations include both combustion of fuels and industrial processes in the supply chain to produce Chinese exports. 27% of China's export emissions are attributed to the U.S., 19% to the EU-27, 14% to the remaining Annex B countries, and 40% to the non-annex B developing world. Improvements to China's inefficient and coal-based electricity system would be good for everybody.