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Carbon emissions from a car are limited to those associated with fuel consumption. With the exception of hydrogen and electricity all automotive fuels emit carbon directly. In those two cases the processes used to generate the electricity may emit carbon.

1) Liquid Hydrocarbon fuel emissions: These are directly related to fuel consumption,. As fuel molecules are essentially of the formula CnHn+2 the fuel emits 24 mass units of carbon per 26 mass units of fuel (about 640 g per litre of fuel). Simply tab up total lifetime fuel consumption and do the math.

2) Methane: Methane (CH4) produces 12 mass units carbon per 16 mass units of fuel. Calculate mass from gas volume at STP, liquid volume, or mass consumed.

3) Alcohol based fuel: Ethanol (C2H6O) releases 24 mass units per 46 mass units of fuel (about 400 g/litre of fuel) calculated emissions from total consumption over the car's lifetime.

As construction and disposal are outside of the parameters of the question the emissions of these sources are not specified.

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Q: How do you calculate the whole life carbon emissions of a car?
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