Estimate the amount of carbon put into the atmosphere in 1 year by the consumption of crude oil in the US ?

Estimate the amount of carbon put into the atmosphere in 1 year by the consumption of crude oil in the United States. Assume U.S. crude oil consumption is at 20 million barrels/day and the energy content of a barrel of oil is 45 x10^18 J/barrel. Carbon emissions is at 20 megatons C per 10^18J.

How much would total emission be affected if the US obtained an equivalent amount of energy through coal?

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