CO2e is short for “carbon dioxide equivalents”. It is a measurement tool used for comparing various greenhouse gases’ emission based on their global warming potential.

CO2e distinctively compares over 100 years how much CO2 would be required to achieve the same global warming effect to the effects of a certain greenhouse gas thus stating the global warming contribution of the GHG.  

For instance, methane (CH4) has 23 times the global warming potential of CO2, while nitrous oxide (N2O) has roughly 300 times the potential of CO2.