Presentation of non-CO2 effects at the Paris Air Lab of the Paris Air Show

Nicolas Bellouin, director of Climaviation, was invited to present the total climate impact of aviation, with a presentation of the science of non-CO2 effects at the Paris Air Lab during the Paris Air Show in June 2023.

You can watch the presentation by clicking on the video on the right. The conference starts at the 57st minute.

CO2, NOx, water vapour and aerosols: how to properly account for all the climate effects of aviation

TheConversation France article on the effects of aviation on the climate published on November 15, 2022.

Like any economic sector, aviation has an impact on the climate and contributes to ongoing global warming.

This contribution is largely dominated by in-flight emissions from aircraft: it is due to carbon dioxide (CO2) emissions – in 2018, they represented 2.5% of global CO2 emissions from fossil fuels – but also to a number of so-called “non-CO2” effects.

These “non-CO2” effects are related to nitrogen oxides (NOx), water vapour, and particulate matter – also known as aerosols when these particles are airborne – emitted during the combustion of paraffin by engines.

Read the interview

Climaviation, an innovative project to reduce the impact of aviation on the climate

Interview with Nicolas Bellouin, climatologist at the Institut Pierre-Simon Laplace, conducted by Sorbonne University.

The Climaviation project aims to better understand and quantify the climate impacts of aviation. It is led by Nicolas Bellouin, a climatologist in the United Kingdom and holder of the Aviation and Climate Chair at the Institut Pierre-Simon Laplace (IPSL). This contributor to the sixth IPCC report explains the objectives of this ambitious project, which brings together scientists from the IPSL and the French Aerospace Lab (ONERA).

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Olivier Boucher, Audran Borella, Thomas Gasser and Didier Hauglustaine (2021). On the contribution of global aviation to the CO2 radiative forcing of climate. Atmospheric Environment.


The Climaviation team. Annual report Climaviation 2021-2022

Etienne Terrenoire, Didier A. Hauglustaine, Yann Cohen, Anne Cozic, Richard Valorso, Franck Lefèvre, and Sigrun Matthes. Impact of present and future aircraft NOx and aerosol emissions on atmospheric composition and associated direct radiative forcing of climate. Atmospheric Chemistry and Physics.

Didier Hauglustaine, Fabien Paulot, William Collins, Richard Derwent, Maria Sand & Olivier Boucher. Climate benefit of a future hydrogen economy. Communications Earth & Environment.


The Climaviation team. Annual report Climaviation 2022-2023

Kevin Wolf, Nicolas Bellouin, and Olivier Boucher. Long-term upper-troposphere climatology of potential contrail occurrence over the Paris area derived from radiosonde observations. Atmos. Chem. Phys.

Olivier Boucher, Nicolas Bellouin, Hannad Clark, Edward Gryspeerdt, and Julien Karadayi. Comparison of Actual and Time-Optimized Flight Trajectories in the Context of the In-Service Aircraft for a Global Observing System (IAGOS) Programme. Aerospace.