We work towards a fossil-free internet by 2030
The Green Web Foundation is an independent non-profit that tracks how much of the internet runs on green energy. Manage the environmental impact of your digital products. Apply best practices in digital sustainability. Advocate for a more sustainable and just internet.
Get Verified
Are you a hosting provider using green energy? Get verified for free. Your services will be listed in our Green Web Dataset — accessed millions of times a day.
WHAT WE DO
Dataset
Check if a website runs on 100% green energy. View public evidence of claims. Download our open dataset or use our API.
CO2.js
Estimate the carbon emissions of apps, website and software with our open source Javascript library.
Training
We deliver training and workshop sessions to support organisations at any stage of their digital sustainability journey.
Branch Magazine
A carbon-aware magazine written by and for people who dream of a sustainable and just internet for all.
Recipient of the Ars Electronica Award for Digital Humanity.
Latest issue: Issue 9: Attunement: Desiging in an era of constraint. A collaboration with critical infrastructure lab.
Carbon.txt
A single place on any domain – /carbon.txt – to discover and use public, machine-readable, sustainability data relating to that company.
Fellowship
Green Web Fellows work at the intersection of digital rights and climate justice. They learn together about what powers control the internet, and what we can do about it.
Green Screen Coalition
Connecting digital rights and climate justice practitioners and funders.
SUPPORTED BY
ESTIMATING DIGITAL CARBON EMISSIONS WORKSHOP
Are you a developer and want to learn more about the tools you can use for digital carbon estimation? Do you work on sustainability reporting but don’t know how to include digital carbon emissions? Then come to our hands-on two-hour online workshop!
ENVIRONMENTAL IMPACTS OF AI BRIEFING
Do you want to understand the environmental impacts of artificial intelligence, and what can be done to manage the harms? This 90-minute online briefing explains the key environmental issues of AI to people with little time in their diaries and a need to make better informed decisions.
Blog
- Carbon.txt version 0.4
We’re happy to announce the release of carbon.txt v0.4 – an updated version of the carbon.txt syntax, which allows for a more flexible and nuanced… - Release Guide: CO2.js v0.17CO2.js v0.17 adds subpath exports to the library, providing a more consistent experience for ESM and CJS users. The update also includes information for developers…
- Reflections on TPAC 2025Fershad from our team had the pleasure of attending the W3C’s annual TPAC meeting this year. In this post, he shares his reflections on the event.
Get involveD
Our work is open-source by default and contributions and participation is welcome across all of our projects.
For our technical work, all our GitHub repos are open for comments and issues. Start on our tools page to navigate to the relevant repo.
For any of our other work, if you are interested in collaborating or contributing then drop us a line through our support form.
We also welcome financial contributions to help keep our work impactful and cutting edge. Find out more about how to donate as an commercial organisation, a grantmaker or an individual on our donate page.