A conference powered by 
Green IO Paris
Building European Green IT
Green IO is where Tech leaders join forces to overcome unprecedented sustainability challenges in IT. With the explosive adoption of generative AI, governmental pushbacks against climate policies and...
December 9 to 11, 2025
CNIT Forest - La Défense
40+
speakers
800+
Attendees
20
countries
Agenda
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Day 1: Workshop Day
Tuesday 9th December 2025
11:00 to 11:25WorkshopSee moreReduce cloud emissions, save millions – engineering workflows using Infracost & Greenpixie
Infracost brings real-time cost awareness into engineering workflows. Greenpixie does the same for cloud emissions. By combining these two datasets at the point where infrastructure decisions are made, teams gain a clearer picture of both the financial and environmental impact of their changes. This unified view helps engineers identify optimisations that drastically cut emissions while also increasing cloud cost savings. In this session we’ll demo the joint workflow and show how teams can start applying it immediately.In collaboration with
11:30 to 11:55WorkshopSee moreScaling up environmental assessment : how Eviden uses Resilio DB
An even more accurate, automated and agile approach to assess and control the environmental footprint of Eviden’s products.In collaboration with
12:00 to 12:25WorkshopSee moreFrom our public map to an enterprise API: How businesses leverage Electricity Maps API for Green IT
People know Electricity Maps from our first product, our map. Our real strength, however, is in the data we collect, harmonize, and produce with our estimation and forecasting models. This workshop will present our business product: the Electricity Maps Enterprise API, and the work that goes into making high-quality data available through it. This product is today used by major global companies, and is core in sustainable IT solutions built by Google Cloud, Cisco, Logic Monitor, and more. We will showcase a few use cases and how you can get started with our API today.In collaboration with
12:30 to 12:55WorkshopTitle TBA
In collaboration with
13:00 to 14:00Lunch Break & Networking | Nicolas Delay's art exhibition
14:00 to 14:25WorkshopSee moreGet to know TCO Certified Cloud — the first sustainability certification for cloud services
For thousands of organizations, TCO Certified is a trusted tool to procure and manage IT products more sustainably, backed by over 30 years of progress in the sector. At this workshop, you’ll see how TCO Certified Cloud will build on this experience to address key sustainability and reporting challenges in the cloud ecosystem. You’ll also learn how you can support its implementation to help drive more sustainable cloud services.In collaboration with
14:30 to 14:55WorkshopSee moreA day in the carbon life of an LLM prompt: why Large Language Models' environmental footprint may be far less than the footprint of their software scaffolds, and how that changes our metrics, advocacy and policy approach
Participants will track a prompt’s journey from query to response using a new open-source tool, revealing the environmental impact of LLM software scaffolds. We’ll compare the impact of model types, tuning methods, context and response lengths, system prompts, prompt injection, tool use and architectures on token count, inference emissions, and enabled emissions. Results will show that the most polluting model with the least polluting scaffold is still greener than the reverse, highlighting that software implementations, being deterministic, interpretable, and traceable, are key to new approaches in environmental AI metrics, design, and policy.In collaboration with
15:00 to 15:25WorkshopSee moreBridge the transparency gap: evaluating LLMs footprint with EcoLogits
In collaboration with
15:30 to 15:55WorkshopCommunity sponsors' pitching time
In collaboration with
16:00 to 16:30Coffee Break & Networking | Nicolas Delay's art exhibition
16:30 to 16:55WorkshopSee moreUsing carbon.txt to boost transparency inside your company
In collaboration with
17:00 to 17:25WorkshopSee moreDivide every year your environmental impact with the EROOM framework
Digital systems keep growing, but their environmental impact doesn’t have to. The EROOM framework offers a simple, evidence-based way to identify inefficient services and reduce their footprint year after year. In this session, we’ll explore how EROOM was created, then run a fast workshop to apply its workflow: quick diagnosis and prioritisation. You’ll leave with the tools to start reducing impact immediately.
Morgane Eckert Boavizta | WeScale
Raphaël Lemaire Bovizta | Zenika
Samia Kherrati Boavizta | WeScaleIn collaboration with
17:30 to 17:55WorkshopSee moreDigital ecodesign: let’s take the bet on common frameworks and standards
Not the right abstract!! Within its strategy on digital ecodesign, Thales Cybersecurity and Digital Identity has decided to rely on common frameworks and standards to implement best practices. Thus, we propose to give our feedbacks on the impleucts, and to explain how we plan to contribute to the future evolutions of this framework. As an international company, we are also involved in standardization activities, and we propose to share some insights about the future technical specifications from ISO on digital ecodesign (TS 20125) that will be published Q1 2026. -
Day 2: Green IT from the trenches ... and still winning!
Wednesday 10th December 2025
09:40 to 09:50OPENING REMARKSSee moreOne step after another: finding the right pace for sustainability amid headwinds
09:50 to 10:20KeynoteSee moreTitle TBA
10:20 to 10:50Coffee Break & Networking | Nicolas Delay's art exhibition
10:50 to 11:15TalkSee moreEnvironmental impact of AI servers worldwide over a year (exclusive updates)
What is the real environmental and health cost of IA? What are its impacts with regards to our planetary boundaries? Discover the sources of these impacts, unexpected data mined during the study, why we should use it with care and diligence and some opportunities to make it less bad. The study was crafted with heart by the team of engaged volunteers of the Association Green IT!11:20 to 11:30NEWSSee moreQuick industry announcements in IT Sustainability
11:30 to 12:50Sustainable Digital ChallengeSee moreFinal Pitches for the Sustainable Digital Challenge!
Right from the trenches teams will pitch their achievement in reducing the environmental footprint of their Tech stack. For the AI challenge the contenders are: SNCF, Bpifrance, Groupama and AXA. For the web challenge the contenders are INSEE, Younited, Botify.com, and Enedis.
AXA team AXA
Bpifrance team Bpifrance
Botify team Botify
Enedis team Enedis
Groupama team Groupama
SNCF team SNCF
Insee team Insee
Younited team YounitedIn collaboration with
12:50 to 14:00Lunch Break & Networking | Nicolas Delay's art exhibition
BOOK SIGNINGSee moreBook Signing "Géopolitique du numérique"
14:00 to 14:25TalkSee moreMastercard are saving millions of dollars and hundreds of MTC02. Now it is time for Europe-driven success.
How to Unlock the Double-Wins of Cloud Sustainability. Using real-life case-studies, this session explores how enterprise cloud users can deliver cloud optimisation initiatives which deliver business value, driven by GreenOps data. This session will share Europe and global use cases, including TeamSystem and ABN Amro. The session will also include Sustainable AI, a rapidly growing pressure on cost and emissions targets.14:30 to 14:55TalkSee moreCarmen: Amadeus' open-source tool to measure your entire applications portfolio impact
Amadeus is the world leader of IT solutions for the tourism industry. Which means hundreds of applications running in the Cloud. After 3 years of development and close collaboration with the Green Software Foundation, our GreenIT Program is open sourcing its Carbon Measurement Engine - aka Carmen. What is it and why did we need a specific tool on top of GSF’s Impact Framework? How can YOU leverage it to reduce your environmental footprint and have a positive impact in your organization? Join us to discover it!15:00 to 15:55Sustainable Digital Challenge JurySee moreSustainable Digital Challenge: Award Ceremony
Aurore Tual ISO & CEN-CENELEC | Thales
Christine Applanat Credit Agricole Group Infrastructure Platform
Julie Ravillon Salesforce
Laurent Guédon Radio France
Louise Vialard ADEME
Samuel Rincé GenAI Impact
Thomas de Latour Sobriété NumériqueIn collaboration with
16:00 to 16:30Coffee Break & Networking | Nicolas Delay's art exhibition
16:30 to 16:55TalkSee moreCarbon accounting at scale: how Crédit Agricole Group Infrastructure Platform fosters its low-carbon transformation
Credit Agricole Group Infrastructure Platform achievements and lessons learned during a transformative journey designing, building and deploying our GHG reporting & accounting information system to provide reliable assessments of ICT footprint to the business entities of Crédit Agricole and to our teams to work both on sufficiency and eco-efficiency to foster low-carbon IT transformation.17:00 to 17:25TalkSee moreThe invisible cloud: solving the Kubernetes carbon mystery
Kubernetes has a dirty secret: its power -abstraction, dynamic scheduling- makes its carbon footprint vanish. How do you solve a crime with an invisible culprit? Become a cloud detective! Using tools like Kepler and KEIT, we'll uncover energy waste, expose overprovisioning, and plot a course for a leaner cluster. Leave with a practical playbook to reduce your cloud emissions.17:30 to 17:5518:15 to 22:00Green IO x Tast’IT Apéro
In collaboration with
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Day 3: AI environmental footprint from all angles
Thursday 11th December 2025
09:15 to 09:4009:45 to 10:40KeynoteSee moreHot takes, cool planet: debating AI sustainability
Join three leading AI sustainability experts in a fast-paced, live debate session where they defend provocative positions, some they may not even believe. Through humor, rigor, and audience interaction, we’ll explore the paradoxes of AI and climate: from proxies vs. real data, to data centers’ local impacts, to whether innovation can solve AI’s energy demands. Expect shifting perspectives, live polls, and actionable insights.10:40 to 11:00Coffee Break & Networking | Nicolas Delay's art exhibition
11:00 to 11:25TalkSee moreIs carbon-aware computing such a good idea?
Carbon aware computing revisited: the uncomfortable truth about a comforting pattern. The idea of shifting compute jobs to the times and places where the electricity mix is most fully powered by renewable sources makes intuitive sense. Yet with two limited exceptions, it won't reduce emissions, and may create perverse effects. The issue may be even bigger, and raises difficult questions about two pillars of digital sustainability, efficiency and emissions, and what happens when we measure the wrong things.11:30 to 11:55TalkSee moreBeyond PUE – why datacenter efficiency is all about IT
As datacenter energy use and emissions continue to rise sharply, relying on isolated metrics like PUE alone no longer reflects true sustainability. This session challenges conventional assumptions by exploring why meaningful progress requires a full-stack perspective – one that integrates IT efficiency, but also waste heat recycling, and carbon impact. Participants will gain insights into how measurable performance, rather than promises or partial indicators, can drive real improvement in digital infrastructure sustainability.12:00 to 12:25TalkSee moreIT Hardware performance & sustainability: lessons from 500 data centre projects and over 1,000,000 benchmark results
IT hardware is a significant investment for companies in both money and environmental impact. In the data centre IT accounts for up to 85% of the total energy draw and requires considerable amounts of carbon, critical raw materials and water to produce. Profiling, benchmarking and understanding IT performance is crucial for making the best decisions on what to buy, how to use it and when to replace or change. This talk will provide a complete understanding of how to use performance metrics such as ITEEsv to make data led decisions on IT projects and will demonstrate how IT performance has evolved over time and how use impacts performance.12:30 to 12:55Panel Discussion21 NGOs share views on Tech sustainability in Europe and potential areas of collaboration
In collaboration with
13:00 to 14:00Lunch Break & Networking | Nicolas Delay's art exhibition
14:00 to 14:25Panel DiscussionSee moreHow to measure the environmental footprint of AI?
14:30 to 14:55TalkSee moreImposing AI: Deceptive design patterns against sustainability
Generative AI is being massively deployed in digital services, at a scale that will result in significant environmental harm. We document how tech companies are transforming established user interfaces to impose AI use and show how and to what extent these strategies fit within established deceptive pattern categories. We identify two main design strategies that are implemented to impose AI use in both personal and professional contexts: imposing AI features in interfaces at the expense of existing non-AI features and promoting narratives about AI that make it harder to resist using it.15:00 to 15:25TalkSee moreWe need to talk about AI, sustainable AI
Since November 2022, we’ve heard a lot about Generative AI and how powerful this tool is and will be. But with great power comes great responsibility (and often, great environmental costs). In fact, it’s estimated that AI alone could account for 14% of total global emissions by 2040, while its water usage may hit 6.6 billion cubic meters by 2027. However, sustainability is not just about the environment: it's also about people, ethics and transparency. We will explore some of the current issues surrounding such powerful tools in order to pave the way for true innovation.15:30 to 15:55Coffee Break & Networking | Nicolas Delay's art exhibition
15:55 to 16:20TalkSee moreMore than carbon: what's the environmental footprint of Nvidia Chips powering AI?
The rapid expansion of AI has intensified concerns about its environmental sustainability, yet current assessments predominantly focus on operational carbon emissions. Our study presents the first comprehensive multi-criteria lifecycle assessment of AI training, examining 16 environmental impact categories through primary data collection and elemental analysis of the Nvidia A100 GPU. Carbon-only accounting fundamentally misrepresents AI's globally distributed impact profile, creating a dangerous blind spot in the sustainability discourse. Sustainable AI development demands fundamental changes in how we assess, communicate, and govern AI's environmental impacts.16:25 to 16:50TalkSee moreLimits to the evidence on AI’s climate benefits and their implications
What evidence supports AI’s positive impact on the environment? Since 2018, several reports have explored AI’s potential, but their findings are contested in academic and policy debates. The first part of this presentation reviews the different forms of evidence available, which comes mainly from expert surveys, economic models, and catalogues of use cases - mostly focused on machine learning rather than generative AI. The second part of the presentation examines the implications: weak accountability mechanisms make such evidence unreliable and hinder efforts to assess impacts at scale.
Meet the speakers
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Tim Cowlishaw
Green Web Foundation -
More panelist soon
... and more to come!
Meet our partners
Members of the Paris Green IT ecosystem as well as our corporate partners will be available to exchange with you on how to accelerate your digital sustainability journey.
Global Premium
Global Champion
CHAMPION
Community
Non Profit
Why they attended our past Paris editions
“Sustainability is one of the most important subjects facing technology companies today. The Green IO conference is without doubt one of the best places to learn about industry best practices, to exchange ideas and to discuss with others facing similar challenges.”
Diarmuid GILL, CTO (Criteo)“The Green IO conference in Paris this year was highly appreciated for its practical approaches to digital sustainability, grounded in the real-life experiences and shared insights of development teams and architects.”
Maija Fournier, Platform Architect (OECD)“It was a pleasure to participate in the Green IO 2023 forum! In the very technophile setting of the API Days, a great day of acculturation on the climate issues of digital activity. Top-notch speakers to raise awareness, engage the dynamics of eco-responsibility and illustrate concrete initiatives from players in digital, travel or industry. Positive challenge!”
Cyril Casenave, Head Of API & Digital Assets (Club Med)
“The blossoming of tools and initiatives in greening IT is a heart-warming signal from the digital sector. More than ever sharing experience and insights is pivotal for actors to ramp-up their effort.”
Gaël Duez
Green IO Founder
About Apidays
Apidays is the world's leading series of API conference. In today’s intricate digital landscape, APIs have emerged as powerful conduits for innovation, bridging the gaps and unlocking new realms of possibility.
December 9 to 11, 2025
CNIT Forest - La Défense