MtCe is an abbreviation for "Metric tons of Carbon equivalent," a unit utilized to gauge the quantity of carbon based on its climate impact, expressed as the equivalent amount of carbon dioxide. It compares the effects of different greenhouse gases and their global warming potentials.

For example, methane has a potency of approximately 25 times greater than CO2 over a 100-year period. Therefore, one metric ton of methane equals 25 MtCO2e or CO2e.