If total matters then it's historic total per capita where US is (far) ahead, "current" is 100s of years on climate scale. Unless one insists on only stats that makes PRC to blame. All per capita GDP vs per captial emissions reflects is PRC gdp per capita (btw PPP is 1/3 US) is massively underreported, i.e. comports with other proxy indicators like how PRC consume a lot of goods at per capita rates higher than 1/6 nominal and 1/3 per capita would suggest.