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Celsius consultant

GuillaumePakula

PhD in physics - Co-founder of Celsius

With a PhD in physics (Polytechnique, ESPCI Paris), Guillaume co-founded Celsius in 2019 after three years of laboratory research. Since then, he has led more than 80 climate diagnostic projects, trained more than 50 Bilan Carbone® cohorts for IFC, and teaches carbon accounting at Institut Polytechnique de Paris.

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32 published articles, latest on 5 Oct 2026

Portrait of Guillaume Pakula
Education
PhD - École polytechnique, ESPCI Paris
Expertise
Bilan Carbone®, LCA, digital and AI scope 3
Teaching
Institut Polytechnique de Paris, IFC
Projects
80+ climate diagnostics since 2019
Publications

Articles by Guillaume

32 articles
of 4
Frequently asked questions

Common questions

The questions we hear most often about Guillaume’s work and how to start a project.

Organisational Bilan Carbone® (ABC v9), Bpifrance Diag Décarbon’Action (in French), product LCA (in French) and eco-design support. He leads Celsius’s AI and digital work: carbon footprint of generative models, digital scope 3 audits, data centres and SaaS.
Yes. Since 2020, Guillaume has trained more than 50 Bilan Carbone® cohorts for Institut de Formation Carbone (IFC) and teaches carbon accounting at Institut Polytechnique de Paris. On request, he runs bespoke climate awareness sessions, from half a day to 2 days, for executive committees and CSR teams.
Write directly to Guillaume through the contact form and explain the angle you have in mind. He responds personally to press, podcast and opinion article enquiries within 24 working hours. There is no fixed editorial calendar: subjects come from practical experience, recent projects or regulatory developments.
Yes, in 2 formats: (1) a free 30-minute scoping call to clarify your needs and guide you, or (2) paid expert advice, lasting 2 to 4 hours, for structured feedback on a methodology, an existing deliverable or a carbon decision. Use the contact page to enquire.
Guillaume holds a PhD in physics from École polytechnique and ESPCI Paris. His LinkedIn profile is kept up to date with projects, training and public speaking, including ABC conferences, Polytechnique and business schools.
The Celsius team

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