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roughly 11% of CO2 in the atmosphere is contributable to humans' use of fossil fuel. The largest contributor to atmospheric CO2 is biomass degradation from rotting vegetation in rain forests and jungles. CO2 in the atmosphere amounts to only a fraction of 0.1% of the atmosphere, which is primarily Nitrogen (~79%) and Oxygen (~21%).

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Q: What percentage of carbon dioxide emissions is due to the use of fossil fuels?
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World's carbon dioxide emission from the use of the fossil fuel 2002?

The worlds carbon dioxide emissions from the use of fossil fuels has decreased since 2002. The United States has had the largest decrease in carbon dioxide emissions.

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