Metadata only
Date
2022-08Type
- Journal Article
Abstract
To meet ambitious climate targets, the aviation sector needs to neutralize CO2 emissions and reduce non-CO2 climatic effects. Despite being responsible for approximately two-thirds of aviation's impacts on the climate, most of aviation non-CO2 species are currently excluded from climate mitigation efforts. Here we identify three plausible definitions of climate-neutral aviation that include non-CO2 forcing and assess their implications considering future demand uncertainty, technological innovation and CO2 removal. We demonstrate that simply neutralizing aviation's CO2 emissions, if nothing is done to reduce non-CO2 forcing, causes up to 0.4 degrees C additional warming, thus compromising the 1.5 degrees C target. We further show that substantial rates of CO2 removal are needed to achieve climate-neutral aviation in scenarios with little mitigation, yet cleaner-flying technologies can drastically reduce them. Our work provides policymakers with consistent definitions of climate-neutral aviation and highlights the beneficial side effects of moving to aircraft types and fuels with lower indirect climate effects. Non-CO2 effects must be addressed for climate-neutral aviation but are currently ignored in international climate policies. The authors provide a framework with different definitions of climate neutrality, then show how technological and demand-side mitigation efforts can help to achieve these targets. Show more
Publication status
publishedExternal links
Journal / series
Nature Climate ChangeVolume
Pages / Article No.
Publisher
NatureOrganisational unit
09451 - Patt, Anthony G. / Patt, Anthony G.
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