Aviation may have contributed as much as 4.9% to global radiative forcing in 2005 and its carbon dioxide emissions could grow by up to 360% between 2000 and 20501. In 2016, the International Civil Aviation Organization adopted a global scheme requiring airline operators to offset increases in carbon dioxide emissions from international flights above 2020 levels2,3. Here we show that the scheme will only compensate for the emissions increase if robust criteria for the eligibility of offset credits are adopted. Offset supply from already implemented greenhouse gas abatement projects registered under the Clean Development Mechanism alone could exceed demand from International Civil Aviation Organization’s scheme. Most of these projects continue abatement even if they cannot sell offset credits. If the scheme allows airline operators the unlimited use of offset credits from already implemented projects, it will result in no notable emissions reductions beyond those that would occur anyway and neither offer incentives for new investments nor reward previous investments in offset projects. We recommend limiting the eligibility to new projects or projects that are at risk of discontinuing greenhouse gas abatement without further support. The findings are critical for negotiations under both the International Civil Aviation Organization and the Paris Agreement.
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Parts of the datasets generated during or analysed for this Letter are available upon request. The data can only be made available in aggregated form and some parts of the data cannot be provided due to the confidential nature of the survey responses and plant-specific data used in this letter.
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L.S. is an alternate member of the Executive Board of the CDM. All other authors have no competing interests.
Journal peer review information Nature Climate Change thanks John Broderick, Susanne Becken and other anonymous reviewer(s) for their contribution to the peer review of this work.
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Warnecke, C., Schneider, L., Day, T. et al. Robust eligibility criteria essential for new global scheme to offset aviation emissions. Nat. Clim. Chang. 9, 218–221 (2019). https://doi.org/10.1038/s41558-019-0415-y
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