The quantity of natural gas (CH4) produced in the USA in 2015 was 28 trillion cubic feet.

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The quantity of natural gas (CH4) produced in the USA in 2015 was 28 trillion cubic feet. Net emissions of methane to the environment during this production were 6.4 million metric tons. The emission factors for bituminous coal and natural gas are 93.3 and 53.07 kg of CO2 per million Btu. 

1. For generating one million Btu of heat from natural gas versus bituminous coal, calculate the difference in CO2 emissions. Ignore the emissions of methane. 

2. Do the same calculation as (1) with emissions of methane included in equivalents of CO2

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