About
We provide the knowledge needed to measure the impact of AI, to limit it and to use AI as responsibly as possible.
AI Impact is the hub of Projet Celsius, an environmental strategy consultancy. There are 4 of us running it.
PhD from the École polytechnique, lead trainer in Bilan Carbone® and life cycle assessment at the Institut de Formation Carbone.
His page and his writing
How we work
The methodology, source by sourceSolid work exists on the impact of AI, measurements, studies, reports; most of it is too technical to be read outside a circle of specialists. We read it, we explain it and we make it reusable by everyone. The hub speaks in 2 ways.
The figures, charts and maps are neutral. They give the order of magnitude, its source and its limitations.
Key figure0.3 WhElectricity used by a written question to an AIReference value · a typical question · independent estimate, February 2025CountedThe graphics cards (GPUs) that compute the answer; The rest of the server and the cooling, through a coefficientNot countedTraining the model; Manufacturing the servers; The user's device and the networkSee the entry →Analyses and viewpoints offer a perspective. They are signed by their author and take a position when needed.
Viewpoint20 October 2026Surface AI and deep AI
By Guillaume Pakula
Use of AI on this site
This site is built with the help of AI, under our editorial direction. Informing and helping decarbonisation is the use we make of it.
- Editorial line and choice of topics
- We
- Reading sources, calculations, writing, code
- We, with the help of AI
- Approval of what is published
- We
Projet Celsius advocates a reasoned use of AI, measured and regulated.
AI worsens climate change. A written question uses little, but the total is rising fast, and emissions follow. A climate benefit of AI has to be shown case by case, backed by figures.
- 1Providers
They publish the energy, water and emissions of each model, with a verifiable method.
- 2Data centres
Their consumption fits within the energy and climate planning of France and the European Union, like that of other sectors.
- 3Organisations
An AI project starts from a need, is compared with a solution without AI, is measured, and is included in the emissions inventory.
Our reading is in line with that of The Shift Project.
Research and accreditations
2026 · Blog article ↗Bulletin of the World Health OrganizationThe carbon emissions of prenatal hepatitis B screening in the Gambia, an article co-signed with the Institut Pasteur.
- Diag Décarbon'Action accreditationBpifrance · Guillaume, Alexandre, Clément
- Diag Éco-conception accreditationBpifrance · Sébastien
- ACT Pas à Pas practitionerADEME and ABC · Guillaume, Clément
- Bilan Carbone® methodology leadABC · Alexandre
Projet Celsius, environmental strategy consultancy
The consultancy carries out Bilan Carbone® assessments and life cycle assessments, and supports organisations on European climate regulation, in Paris and Marseille. It also helps companies measure and reduce the footprint of their AI use.
Visiter Projet Celsius ↗3 years of climate strategy, 70 contributors, one exhibition
See our work ↗
Write to us
An error, a source to add, a question on methodology, a press request: write to us. Guillaume Pakula, Clément Reynaud, Sébastien Pierfederici and Alexandre Veilly will answer you.
Write to usProjet Celsius, which runs this hub, also helps companies measure and reduce the footprint of their AI use. Counting AI in your Bilan Carbone®
Across the hub
AI Impact DatabaseAll the figures, their methodology and their sources.
AI Ranking10 assistants rated out of 100: performance, ethics and environment.
AnalysesThe signed pieces: analyses, viewpoints, "Where does this figure come from?".
Charts and mapsThe reference visuals, with their data and sources.
ToolsOpen calculations, your assumptions on the left, the result on the right.
A question about a figure?
An error, a source to add, a methodology question, a press request: write to us. Guillaume Pakula, Clément Reynaud, Sébastien Pierfederici and Alexandre Veilly will reply.
Projet Celsius, which runs this hub, also helps companies measure and reduce the footprint of their AI use.
Accounting for AI in your Bilan Carbone® ↗
