[Bob434]

[[Every gallon of gas burned emits 20 pounds of carbon dioxide,]]

Huh? A Gallon of gas doesn’t even weigh anywhere near 20 lbs- there’s no way CO2 weighs 20 lbs per gallon of gasoline- the co2 doesn’t weigh more than the fuel itself

[Mr. Lucky]

I have no idea whether the author is correct or not, but the gas mixture which burns in the combustion chamber is made up partly of gasoline and partly of air.