Carbon footprint is typically measured in pounds (or kilograms) of carbon dioxide. Since carbon dioxide is a gas, it expands and contracts with changes in temperature and pressure, making it more convenient for people to measure it by weight. One could also measure it in moles. However, since most people do not remember their high school chemistry well enough to understand the concept of a mole, it makes more sense to measure carbon dioxide by weight when reporting numbers to the general population. Nevertheless, moles are still a vital part of the calculations one must perform to convert pounds of (insert fuel: gasoline, coal, etc.) burned to pounds of carbon dioxide produced. If you would like to see how moles work, check out the second link I provided 🙂
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