1. The UK was in the lead in the beginning because they were a world power. They had many industries, cities, and a huge population.
2. The U.S. passes the UK when it does because the U.S. had many immigrants coming over and we were building up our industry.
3. There was a drop in CO2 emissions in 1929 because of the Great Depression.
4. China enters the graph in 1917.
5. The US consumes more CO2 than China because we have bigger industries.
6. Trinidad and Tobago had an oil boom.
7. Luxembourg was the only city in Germany that wasn't affected by the war.
8. All the countries near the top of the chart are big in industries.
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