GaëtanWittebolle_
I ship service as a software that a team of 10 would spend months to build.
What I
build.
The first tool was born when I moved to Bordeaux, to meet other independents. Since then I have come back to my original trade, carbon measurement, with AI as leverage. My tools make visible what software emits, from a large company's IT estate down to my own Claude Code sessions.
Climate × AI
The IT estate's carbon footprint, from inventory to trajectory
Ten years of IT carbon assessments in Excel, first at EY. Carbonara is the tool I wish I had: the estate inventory, the per-phase calculation, the dashboards and the trajectory, all in one place.
- Who it's for
- Digital and sustainability teams of large organisations
- What it does
- IT estate inventory: devices, servers, cloud, telecom
- Emissions by phase: upstream, use and end of life
- Action plans, SBTi trajectory, BEGES and GHG Protocol reporting
Life cycle (LCA)
Breakdown by type
- Professional services34,2 %4 268 tCO₂e
- Devices33,8 %4 218 tCO₂e
- External hosting18,6 %2 321 tCO₂e
- Telecom11,4 %1 423 tCO₂e
- Internal hosting1,4 %175 tCO₂e
- Other0,5 %62 tCO₂e
Top 5 emission items
- 1. Professional services (scope 1+2+3)14,9 %
- 2. Software and SaaS11,0 %
- 3. Laptops7,3 %
The CO₂ of your Claude Code sessions, in the status line
I code all day with Claude Code and had no idea what it emitted. claude-carbon computes the CO₂ locally from your tokens, shows it next to the cost and keeps the history of every session.
- Who it's for
- Developers using Claude Code, on their own machine
- What it does
- Live CO₂ estimate in the status line, computed locally
- SQLite history, text report, shareable PNG card
- Public methodology, every factor sourced
curl -fsSL https://raw.githubusercontent.com/gwittebolle/claude-carbon/main/install.sh | bashYour AI bill is rising. So is your carbon footprint
The team version of claude-carbon. The Anthropic or OpenAI invoice is a single line. TokenClimate shows who uses what, in which team, on which model, with the CO₂ and water of every session. I install the dashboard with you, then we turn it into decisions.
- Who it's for
- Organisations spending over €2,000 a month on AI: CFO, CIO, tech leads, sustainability
- What it does
- Cost, CO₂ and water per team, per person and per model
- 30-day AI assessment, scope 3 line ready for your carbon report
- No prompt and no code ever leaves the developer's machine
ACME DEMOPeak on May 16.
Pick a dimension on the left.
| Engineering 13 | 3,6 kg | ↑ 17 % |
| Data 13 | 3,5 kg | ↑ 12 % |
| Product 15 | 3,1 kg | ↓ 4 % |
No more working alone, become a buddy
My first product, launched when I moved to Bordeaux to meet other independents. BuddyWorkers gives access to partner spaces and events near you, to work together and help each other out.
- Who it's for
- Tech, communication, marketing and consulting freelancers across France
- What it does
- Coworking in partner spaces, whenever you want
- Meetups and afterworks near you
- Help between members, BuddyTools, BuddyMap
Stop posting into the void
For leaders who know their trade but not how to write in public. Five minutes of voice into a Capsule, Vaniglia transcribes and writes in your tone. The project is on hold, the app stays online.
- Who it's for
- Executives, founders, consultants
- What it does
- Brand diagnostic and editorial pillars
- Capsule: 5 minutes of voice, 3 to 5 ready pieces
From consultant
to solobuilder_
After a few years in consulting, I went freelance. Not a grand plan - more of a desire to pick my own topics and pace.
I went to work a few months from Colombia. The remote life works great; alone in front of a screen, much less. I came back with an idea.
It started as a few coffees with local freelancers. Three years later, 500+ members, ten cities, and a mission-driven company. The first product that stuck.
Ten years of carbon. Now AI as leverage. In 2026 I bring them together: Carbonara becomes licensed software, TokenClimate measures the cost and CO₂ of AI itself. The other products keep running; this is where most of my time goes.
The real
behind-the-scenes_
Once a month, I write what I learn building these products: the numbers, the tools, what doesn't work, what I'd change. Raw, hopefully useful.
Two questions people ask
- Who is Gaëtan Wittebolle?
- Ten years as a carbon consultant, first at EY then independently, now a solo builder in Bordeaux, France. I build tools that make the footprint of software and AI visible: Carbonara for IT assets, claude-carbon (open source) and TokenClimate for Claude Code. I also founded BuddyWorkers, a community of 500+ freelancers in France.
- What is the difference between claude-carbon and TokenClimate?
- claude-carbon is an open-source plugin that shows the CO₂ of your Claude Code sessions in the status line, on your own machine, for free. TokenClimate is the team version: it reads the Anthropic usage of the whole organisation and breaks cost and CO₂ down by person, project and model. Same methodology, two scopes.
A problem
to solve ?
AI labs now send their engineers to set up shop at their clients' and wire AI into the field. I do that work as an independent, with my own tools: Carbonara for IT carbon, TokenClimate for the cost and CO₂ of AI. The deployment is scoped and documented. A first system in production in under 30 days.
- The custom work built for you is yours: code, agents, evals, documentation.
- My products are subscriptions you can cancel: your data leaves in one export, the wiring is documented, no hidden dependency.
- Agent access is separate from human access, scoped to the minimum necessary.