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At the begging the UK is ahead right at the dawn of the industrial age.  When the US starts its industrial age it starts to pass the UK. In 1929 the CO2 dropped because the people in their industrial age finished. China comes into play around 1950. In the U.S. we emit more CO2 per person. In China they emit less per person they just have more people. Trinidad and Tobago started their industrial age in the 1940's. Same with all the other small countries even though they have smaller populations they still use more CO2 in their industrial age.