Per Capita emissions certainly matters, but how much? China's population is 4x larger than the US, and the country's total emissions make up 27% of global emissions versus 11% from the US. (If my quick Google search is correct)

Also remember that much of China's population is far poorer than in the US. It isn't that they don't want luxuries, it's that they can't afford them. Often because their labor is overworked and underpaid. Many of their industry workers are crammed into small apartments. Can you imagine the type of energy China would need if their citizens all had enough money to afford A/C, clothes dryers, personal vehicles, and more space in their homes?

Not saying North Americans don't need to live more frugally with little more than a minor inconvenience, but there's a pretty big difference in quality of life for the workers in each nation. In terms of which nation pays their workers a larger share of the revenue their products generate, that's clearly in favor of the US. It's no surprise that for-profit corporations would rather build manufacturing facilities in China than in the US and then export the products to Western nations using highly pollutive container ships. I'd be curious which country those shipping emissions get attributed to.

The solution to stop people from using all their money on things that drive up energy use has always been a carbon tax, but our politicians have failed to act. Probably because it would not only be unpopular, but it would force even more companies to send jobs to nations without those taxes. (As it they haven't already done so to a huge degree) Those emissions taxes would need to be setup in a way to impose a tariff on imported goods based on the emissions from production.