Which Countries Have Emitted the Most CO2? May 9, 2019 / activist360 / Leave a comment Bar chart race: the countries with the largest cumulative CO2 emissions since 1750. Rankings as of the start of 2019: 1) US – 397 GtCO2 2) China – 214 3) former USSR – 180 4) Germany – 90 5) UK – 77 6) Japan – 58 7) India – 51 8) France – 37 9) Canada – 32 10) Poland – 27 Chart by Carbon Brief based on code by John Burn-Murdoch.