Carbon dioxide makes up 75% of total GHG emissions. CO₂e represents the global warming potential of CO₂ plus the remaining 25% of emissions from methane, nitrous oxide, hydrofluorocarbons, and other potent GHGs converted to carbon dioxide equivalents (CO₂e). CO₂e is measured in metric units, so when we say a ton of CO₂, we mean 1 metric tonne (~2204.6lbs) of CO₂e.