ICAO

CORSIA

The ICAO Assembly agreed to the Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA) in 2016. Implemented by state aviation regulators through the provisions of Annex 16 to the 1944 Convention on International Civil Aviation, CORSIA is the first global market-based measure for any sector and represents a cooperative approach that moves away from a “patchwork” of national or regional regulatory initiatives. It offers a harmonized way to reduce emissions from international aviation, minimizing market distortion, while respecting the special circumstances and respective capabilities of ICAO Member States. CORSIA complements the other elements of the basket of measures by offsetting the amount of CO2 emissions that cannot be reduced through the use of technological improvements, operational improvements, and sustainable aviation fuels with emissions units from the carbon market.

Further information

Carbon Offsetting and Reduction Scheme for International Aviation
(CORSIA)
https://www.icao.int/environmental-protection/CORSIA/Pages/default.aspx

LTAG

The 41st ICAO Assembly adopted a long-term global aspirational goal (LTAG) for international aviation of net-zero carbon emissions by 2050 in support of the UNFCCC Paris Agreement's temperature goal.
The LTAG does not attribute specific obligations or commitments in the form of emissions reduction goals to individual States. Instead, it recognizes that each State's special circumstances and respective capabilities (e.g., the level of development, maturity of aviation markets, sustainable growth of its international aviation, just transition, and national priorities of air transport development) will inform the ability of each State to contribute to the LTAG within its own national timeframe. Each State will contribute to achieving the goal in a socially, economically and environmentally sustainable manner and in accordance with its national circumstances.
The achievement of the LTAG will rely on the combined effect of multiple CO2 emissions reduction measures, including the accelerated adoption of new and innovative aircraft technologies, streamlined flight operations, and the increased production and deployment of sustainable aviation fuels (SAF).

Further information

Long term global aspirational goal (LTAG) for international aviation
https://www.icao.int/environmental-protection/Pages/LTAG.aspx