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verdantcart / carbon-txt

YonasGhe

Platform-agnostic PHP library for generating, publishing, importing, and validating carbon.txt sustainability disclosures per the Green Web Foundation v0.5 specification.

Package info

github.com/YonasGhe/carbon-txt-php

Homepage

pkg:composer/verdantcart/carbon-txt

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Installs: 1

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v0.0.1 2026-09-10 18:49 UTC

Requires

  • php: >=8.0

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None

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GPL-2.0-or-later 3e07c638fa61b14554601ea74d70413682d2d367

e-commerceclimatecarbon-footprintsustainabilityesgcarbon-txtcsrdgreen-web-foundation

Published on Packagist.org on 2026-09-10 18:59 UTC

This package is auto-updated.

Last update: 2026-09-10 19:00:01 UTC

README

Platform-agnostic PHP library for generating, publishing, importing, and validating carbon.txt sustainability disclosures per the Green Web Foundation v0.5 specification.

Status: early development — v0.1.0 ships October 2026.

Part of: VerdantCart AI — open sustainability tooling for WooCommerce.

What is carbon.txt?

carbon.txt is an emerging web standard maintained by the Green Web Foundation. Like robots.txt or security.txt, it's a machine-readable file at a well-known URL (/carbon.txt) that publishes an organization's sustainability disclosures — carbon footprint, reporting period, methodology, and pointers to full disclosures.

Today only enterprise sustainability platforms (Watershed, Persefoni, Sylvera — €500–5,000/month) implement it. This library brings the same capability to any PHP project.

Install

composer require verdantcart/carbon-txt

Quick start

use VerdantCart\CarbonTxt\Generator;
use VerdantCart\CarbonTxt\DTO\Disclosure;

$disclosure = new Disclosure(
    organisation: 'Acme Coffee Roasters',
    domain:       'acmecoffee.com',
    reportingPeriod: '2026',
    scope1: 42.3,
    scope2: 128.7,
    scope3: 3412.9,
);

$generator = new Generator();
echo $generator->render($disclosure, specVersion: '0.5');

Full docs coming with the v0.1.0 release.

Roadmap

Version Focus Target
v0.0.1 Package name reserved on Packagist Sept 2026
v0.1.0 Generator + Publisher + Importer + Validator + WordPress adapter Oct 2026
v0.2.0 DIST schema alignment Q1 2027
v1.0.0 Stable API, docs, third-party adopters Q2 2027

Development is grant-supported via NLnet Restack (application in review).

Contributing

This library is open source under GPL-2.0-or-later. Issue reports, spec-alignment questions, and third-party integration feedback all welcome.

License

GPL-2.0-or-later. Compatible with WordPress plugins, e-commerce platforms, and any GPL/GPL-compatible codebase.

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