As a global scheme, CORSIA will result in a greater CO2 mitigation in international aviation. It is forecast that CORSIA will mitigate around 2.5 billion tonnes of CO2 between 2021 and 2035, which is an annual average of 164 million tonnes of CO2. This represents an investment of about USD40 billion in climate projects (assuming that the price of carbon will increase from USD8 in 2021 to USD20 in 2035).
CORSIA has three implementation phases, beginning 2021. Participation of countries until 2026 is voluntary. As of January 2018, more than 70 countries representing more than 85% of international aviation activity have volunteered to participate.