MtCO2év
MtCO2e stands for megatonnes of CO2 equivalent and is a standard unit used to express the total climate impact of a mixture of greenhouse gases. It converts different gases to a common basis by applying their global warming potential (GWP) relative to carbon dioxide over a chosen time horizon, typically 100 years. A megatonne (Mt) equals one million metric tonnes, so MtCO2e represents one million tonnes of CO2-equivalent emissions or removals.
Calculation involves multiplying the mass of each greenhouse gas by its GWP and summing the results across
Time horizon matters. The most common reference is GWP over 100 years (GWP100), but other horizons (e.g.,
Limitations include the aggregation of gases with different lifetimes and radiative behaviors, which can obscure gas-specific