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Gasoline weights about 6.3 pounds per gallon. Each gallon of fuel results in 20 pounds of CO2, because carbon from the fuel combines with oxygen in the air. C12 + O16 + O16 = CO2.

I fill my car once about once a week. Some people drive a lot more, and others a lot less, but I figure my car is probably close to average. The tank holds 15 gallons, so that is 15 x 20 = 300 pounds of CO2 per week. I drive about 50 weeks out of the year, so 50 * 300 = 15,000 pounds of CO2. That is about 7.5 tons per vehicle per year.

Humans emit a little over 30 billion tons of CO2 per year altogether. Americans burn 375 million gallons of gas a day, emitting about 1.4 billion tons of CO2 per year. If we divide that by 7.5 we get 182 million vehicles, pretty close to one car for every two Americans. The math checks out reasonably well.

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11y ago
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11y ago

Much of the additional atmospheric CO2 each year comes from burning coal for electricity. Automobiles are a close second to that, however.

Current production is about 32 billion barrels of oil per year. There are 6 to 8 barrels per ton, averaging 4.5 billion tons per year. Not all this oil is used for automobile fuel, some of it is used for lubricant, manufacture of plastics, and so on.

The US consumes about 134 billion gallons of gasoline per year (2011, EIA), which is roughly 46% of the global figure. So 134/.46 = 290 billion gallons per year world wide. That includes what is used by boats, and I believe diesel engines also, used by trucks and trains and so on.

Each gallon weighs approximately 6.3 pounds, but when burned produces 19 pounds of CO2. This is because the oxygen from the atmosphere is combined with the carbon gas. So 290 billion gallons x 6.3 pounds/gallon x 19 = 35 trillion pounds of CO2. This works out to about 17 billion tons per year.

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one gallon of gasoline produces 19 pounds of carbon dioxide
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Q: How many tons of carbon dioxide are pumped into the atmosphere by cars?
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Cars and factories.


Do cars omit carbon dioxide?

No, they release carbon and others from the exhaust but later the carbon goes through synthesis in which it forms carbon dioxide in the atmosphere.


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Solar powered buildings and cars reduce carbon dioxide that is added to the atmosphere because instead of having the process of burning like fossil fuels they take in the light energy from the sun, store and use it.


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