News
Read the latest news about the carbon.txt project from the Green Web Foundation blog.
Release Guide: CO2.js v0.19
:CO2.js v0.19 introduces the ability for developers to lookup a domain for the presence and contents of a carbon.txt using the Green Web Foundation carbon.txt API. Perform carbon.txt lookups with Co2.js Recently, we made our carbon.txt API public allowing anyone to look up, parse and validate carbon.txt files in their own applications. In this release…
[read more]Lessons learned extending carbon.txt to support the Blue Angel
:Earlier in 2026, at the Green Web Foundation we began investigating how we might expand support in carbon.txt to work with various sustainability labels. One of the more promising ones that caught our eye was Germany’s Blue Angel for Software – the first ever sustainability for label for software. In this post Director of Technology…
[read more]Announcing API Access to carbon.txt
:We’re making our carbon.txt validation API available for public use, allowing anyone to look up, parse and validate carbon.txt files in their own applications.
[read more]Consulting on supporting certification schemes in carbon.txt
:Discover how you can help shape support for certification schemes in the carbon.txt proposed standard. If you’re using or rely on digital sustainability based certifications – like Blue Angel, TCO Certified Cloud or B Corp for example, we’d love to hear from you. Carbon.txt developer Tim Cowlishaw introduces the proposed changes. You can contribute to the…
[read more]AI model cards in carbon.txt and an AI Sustainability Directory
:As part of a recent workshop we held at the Green IO Singapore conference, we made updates to the carbon.txt syntax to allow AI model information to be disclosed. In this post, our man in Asia, Fershad Irani, introduces this new disclosure type, shows how it can be used to choose sustainable models and demonstrate…
[read more]Create carbon.txt files using our new python package
:We’ve recently released an update to our carbon.txt python library to allow developers to create carbon.txt files programmatically and integrate carbon.txt support in their own applications. Read on to find out how to make use of it, and to see how we integrated it to help verified hosting providers create a carbon.txt for their organization…
[read more]Linking domains to verified providers with carbon.txt
:We’ve been exploring a few ways in which we could use carbon.txt within our own platform for provider verification. In this post, Fershad and Tim introduce one such use case – linking domains to verified providers in order to deliver more accurate results from our Green Web Check API.
[read more]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 description of your sustainability claims. In this post Tim explains what the new functionality is, how it benefits carbon.txt users, and how organisations or individuals can help us shape it…
[read more]A *May* update on the first E.E.D. day in Europe
:On this blog we’ve been written about the Energy Efficiency Directive, a European energy and transparency law a few times now. We’ve done this because we we care about a fossil free internet, and the law looks like it could give new insights into how far along Europe it to reaching this state, as well…
[read more]Using carbon.txt with CSRD reports
:In this post we explain how our latest project, carbon.txt, can be used to share Corporate Sustainability Reporting Directive (CSRD) reports and find specific sustainability data points within them. We cover the tools we built and you can use them. “Users of sustainability information increasingly expect such information to be findable, comparable and machine-readable in…
[read more]