This indicates the amount of carbon dioxide emissions caused directly or indirectly. Depending on the definition, the value often includes other greenhouse gases (for example, methane or nitrous oxide) in addition to carbon dioxide, which are usually calculated in metric tons of CO2 equivalent. The term can be applied to people, products, companies, organizations and countries, among others.
The CO2 footprint of a product considers greenhouse gas emissions along its entire value chain. Life cycle analysis provides a broader definition. (c.f. Life Cycle Assessment, LCA)