Every value cites its source · MasterBrain v2026.284 · 21,133 factors · updated 6 Nov 2026
Independent bodies and practitioners who verify a greenhouse-gas inventory or report against a standard such as ISO 14064-3 — the people you go to once a number has to survive scrutiny.
Curated · chosen by us, not paid for
US certification body doing ANAB-accredited greenhouse-gas verification to ISO 14064 and EPD verification to ISO 14025 and EN 15804.
Why we listed themListed for scale with a named accreditation: hundreds of ISO 14064 verifications under ANAB accreditation, with the standards stated on their own service pages.
View profile →Independent verification of greenhouse-gas assertions to ISO 14064.
Why we listed themListed because they say which parts of ISO 14064 they verify against.
View profile →US environmental verification body, ANAB-accredited to ISO 14065 since 2008, verifying GHG inventories and registry claims to ISO 14064-3.
Why we listed themListed because the accreditation trail is public: ANAB accreditation to ISO 14065 held since 2008, with the verification standards named on their own service pages.
View profile →UKAS-accredited GHG verification (0008-GHG), and CSRD/ESRS reporting advisory.
Why we listed themListed twice, for two different services.
View profile →These listings rotate daily, so nobody holds the top spot. Paying would add a listing to a separate sponsored section above this one — it never buys a position inside the curated list, and it never changes who appears in it.
Before you appoint one
We do not verify these answers for you — we check that a provider states them publicly before we list it. The rest is yours to ask.
Or tell us the job
If you’d rather not read every profile: say what needs doing and where you are, and we send back the two or three names here that fit. Answers come from the curated list only — a paid listing never buys a place in an answer.
Forwarded to jeremiah@greencalculus.com and discarded — no list, no marketing. Shortlists are pointers, not endorsements: the same checks in “how we chose them” apply, and the appointment is yours to make.
For providers
Do this work? A listing puts you at the top of this page, with your logo, a named contact and an enquiry form that reaches them — US$390 a year.
How listings work →Listings are selected by us and are not recommendations, endorsements or an assurance of quality. We do not verify providers’ claims. Nothing here influences our emission factors, methodology or calculator results.
