In 2021, Canada’s emissions from marine transport were approximately 4 Mt CO2e. Its emissions from domestic aviation were 6 Mt CO2e and its total emissions were 670 Mt CO2e. Worldwide, emissions from domestic aviation were 321 Mt CO2e. All these emissions are counted in national emissions inventories. Emissions from international aviation were 344 Mt CO2e and emissions from international shipping were 670 Mt CO2e; these emissions were excluded from national inventories.