Heating, Occupancy and Energy Assumptions

The sustainability story of IT is deeper than you realise.

And in order for us to find the real answers, we need to read between the lines.

On today’s episode of Green IO, Gaël is joined by Gauthier Roussilhe, an out-of-the-box thinker, researcher and head of R&D at Hubblo. Gauthier takes us on a deep dive into the findings of one of his latest environmental studies… and explains why we need to embrace a counter-intuitive approach when looking at the data.

During this conversation, Gaël and Gauthier also talk about:
▪️ Unpacking the environmental impact of remote work
▪️ Tracing the origins of IT of Green (IOG)
▪️ The hidden data we’re overlooking
▪️ The rebound effect
▪️ Why context is key

And much, much more.

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Connect with Gauthier Roussilhe:
▪️ Website: https://gauthierroussilhe.com
▪️ LinkedIn: https://www.linkedin.com/in/gauthier-roussilhe/

Connect with Gaël and Green IO:
▪️ Website: https://greenio.tech
▪️ Slack: https://greenio-podcast.slack.com
▪️ YouTube: https://www.youtube.com/@greenio877
▪️ Gaël: https://www.gaelduez.com

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Referenced in this episode:
▪️ Study: Environmental assessment of the direct and indirect effects of digital technology on use cases (2025) https://librairie.ademe.fr/economie-circulaire-et-dechets/8073-environmental-assessment-of-the-direct-and-indirect-effects-of-digital-technology-on-use-cases.html
▪️ Report: IEA Energy Technology Perspectives (2024) https://www.iea.org/reports/energy-technology-perspectives-2024
▪️ Study: Purer than pure - How purity reshapes the upstream materiality of the semiconductor industry https://arxiv.org/pdf/2509.18768
▪️ Article: A short visual history of digital infrastructures in the making https://gauthierroussilhe.com/en/articles/a-short-visual-history-of-digital-infrastructures-in-the-making
▪️ Article: Taiwan semi-conductor industry and its ecological impact (FR) https://gauthierroussilhe.com/articles/taiwan-histoires-glorieuses-et-futurs-sombres-de-la-numerisation
▪️ Episode: #58 (Laetitia Borne) https://podcast.greenio.tech/e/4892yryn-58b-avoided-emissions-thanks-to-tech-the-vinted-use-case-with-laetitia-bornes-part-2
▪️ Study: How can we maximize the environmental benefits of teleworking? (2026) https://www.sciencedirect.com/science/article/pii/S0967070X25004081
▪️ Study: Do teleworkers travel less? Evidence from the English National Travel Survey (2022) https://www.sciencedirect.com/science/article/abs/pii/S0965856422000738
▪️ Study: The effects of subsidising e-bikes on mode share and physical activity https://www.sciencedirect.com/science/article/pii/S2214140523001895

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