The Mycelium emissions database

One open database of corporate carbon emissions, built from what companies actually publish.

What this dataset is

Let the data free. Mycelium is an open-access database of corporate greenhouse gas emissions: companies and their scope 1, 2 and 3 figures, held in kgCO2e, alongside each company's Mycelium Score and Transparency Score and links to the reports the figures came from. Anyone can search it, read any company's profile, and cite what they find, without an account and without payment.

Coverage

The database currently holds 17,670 emissions disclosures from 17,539 companies, spanning reporting years 2011 to 2026. The companies span 132 countries and 20 NACE industry sections. These figures are read live from the database as this page renders, so they are current, not marketing copy.

Where the data comes from

The core of the database is what companies themselves have published: sustainability reports, annual reports and regulatory filings. Company identity is anchored to official registries, including Companies House and the GLEIF Legal Entity Identifier system. Companies that claim their listing can also submit figures directly. Our data sources page describes each source, and the methodology explains how figures are extracted, checked, scored and estimated.

One honest caveat: much of the extraction is automated, including the use of large language models to read filings, and that process makes mistakes. Errors and omissions are inevitable, and you should verify figures against the source documents (linked from each profile) before relying on them for decisions.

Reported or estimated: every figure says which

This distinction is the core of the methodology. Every emissions line in the database is tagged with its provenance: company-reported, meaning the company disclosed the figure in its own filing or submission, or Mycelium-estimated, meaning we modelled it against industry benchmarks because the company did not report it. Profiles and their figure downloads both carry the tag.

If you use the data, preserve that distinction. An estimated figure must never be presented as something the company disclosed. That single rule protects the companies in the database, your own work, and ours.

How to access it

Browsing is free and always will be.

  • Browse: free, no account. Search the database, browse by industry, or open any company page.
  • Downloads: every company profile offers its figures for each reporting year as structured data (JSON-LD, in the OpenCCF data model) and as a CSV spreadsheet.

Licence

Use of the data on this site is governed by the Emissions Data Terms of Use. That page is the authoritative wording; read it there.

Citing the data

Any use of the data must include this citation, with a hyperlink:

'Data sourced from Mycelium Network, available at mycelium.global'