CO2 mixes well in the atmosphere and spreads across the world. Whatever it does–a lot, a little, something in between–it does without regard to borders.
However, the top 5 energy consumers consume half the energy produced. That’s China (21%), the U.S.A. (19.3%), Russia (5.9%), India (4.5%) and Japan (3%). Those 5 countries account for almost 51% of all energy consumed globally. Countries 6-10 consume a total of 11%.
Focusing on coal is a lot easier. You don’t need to count to five. Three countries account for 75% of coal consumed in the world–China alone burns 53.4%, followed by the U.S.A. with 13% and India with 9.1%.
If CO2 emissions are a global problem, the rest of the globe should be talking sternly to 5 countries. If in addition we are concerned about pollution, the people in the hot seat come from only 3 countries–with an emphasis on China.