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A Hummer parked in a garage emits almost zero CO2 over the course of a year.

The Hummer H2 gets around 10 to 12 mpg. Assuming the typical owner drives 15,000 miles per year, that is around 1300 gallons of gas. Each gallon of gas burned results in 14 pounds of CO2. Multiplying these last two figures we get 9.5 tons of CO2 emitted per year, per Hummer, on average.

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