What does kg CO2e mean?

Carbon Dioxide Equivalent (CO2e) is the unit of measurement for the warming effect of greenhouse gases.

CO2e is the exchange rate of other greenhouse gases to carbon. The exchange rate expresses how many kg of carbon dioxide emissions warm the climate equally as 1 kg of another greenhouse gas, over a certain period of time (most often 100 years). CO2e translates the potency, how much infrared radiation a ton of each gas absorbs, and longevity, how long a ton of each gas radiates the heat back to the atmosphere, in relation to the emissions of a ton of carbon dioxide. CO2e allows us to compare and equate the effect of different greenhouse gases into a singular climate footprint.