In the calculation, not only carbon dioxide is included, but also methane (CH4) and di-nitrous oxide (N2O), both stronger greenhouse gases than CO2.
Arvutustes võetakse lisaks süsinikdioksiidile (CO2) arvesse ka metaani (CH4) ja dilämmastikoksiidi (N2O), mis on CO2-st kangemad kasvuhoonegaasid.