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How is the baseline calculated and can it change?

Following COVID 19, ICAO revised its baseline calculation and announced only the emissions from the year 2019 will be considered for baseline.


The baseline will be calculated as an average of total emissions covered by CORSIA between 2019 and 2020. In the years 2019 and 2020 all airlines, irrespective of their flag, will have to report all their international flights for the purpose of baselining. Every year after the opt-in/opt-out deadline (30 June), ICAO will determine which routes and their emissions are covered by CORSIA and will recalculate the baseline for the next year accordingly.

The more States decide to participate, the higher the baseline will be.

The figure below shows the variating baseline in random years of the scheme in comparison to the previous baseline and the offsetting requirements.

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