"Out of thin air" is right :-) The CO2 contains mass from the atmospheric oxygen...

		philipkglass on Oct 25, 2023 \| parent \| context \| favorite \| on: Adding crushed rock to farmland pulls carbon out o... "Out of thin air" is right :-) The CO2 contains mass from the atmospheric oxygen consumed during combustion. 12 grams of carbon becomes roughly 44 grams of carbon dioxide when it burns.