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How much CO2 does a human body produce per day?

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Title:
How much CO2 does a human body produce per day?
Topic:
Climate
Question: 

How much CO2 does a human body produce per day and how does this compare to the CO2 released from a gallon of gasoline?

Answer: 

This New Scientist Article suggests that an inactive person exhales about 350 litres of carbon dioxide (CO2) per day.

Several online sources quote a US Department of Agriculture (USDA) study that suggests an average person's respiration generates approximately 900 grams weight (450 liters volume) of CO2 per day. These sources reference a publication "Your Role in the Greenhouse Effect" by Jerry Hannan. I cannot find this original source online.

As noted at SEED FAQ 1171, the CO2 released by burning gasoline (petrol) is approximately:

- 10.7 Kg per imperial gallon - about 5.4 m3 (5,400 liters)
- 8.9 Kg per US gallon - about 4.5 m3 (4,500 liters, 159 ft3)
- 2.4 Kg per liter - 1.2 m3 (1,200 liters)
 

So - based on the USDA estimate, burning one US gallon of gasoline produces ten times more CO2 than one person produces naturally in a day.


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