US is not negligible. They are number 1 per capita.
China just had an astronomically high population. They will always be higher overall due to this.
An actual measurement of this needs to be performed capita.
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If the issue is emissions per capita then the solution is simply to increase the population faster than the increase in emissions.
Similar, countries with aging population will see an increase in emissions per capita regardless if they are actually decreasing emissions, as long the population loss is greater than emissions decreases.