I was confused by the results then read online: "It seems impossible that a gallon of gasoline, which weighs about 6.3 pounds, could produce 20 pounds of carbo

I was confused by the results then read online: "It seems impossible that a gallon of gasoline, which weighs about 6.3 pounds, could produce 20 pounds of carbon dioxide (CO2) when burned. However, most of the weight of the CO2 doesn't come from the gasoline itself, but the oxygen in the air." btw, have O2 levels been dropping over last century? edit: https://weather.com/science/nature/news/earth-atmosphere-losing-oxygen https://weather.com/science/nature/news/earth-atmosphere-los...