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First Environment

US environmental verification body, ANAB-accredited to ISO 14065 since 2008, verifying GHG inventories and registry claims to ISO 14064-3.

First Environment is a US environmental engineering and verification firm, in practice since 1987, providing third-party greenhouse-gas verification and validation to ISO 14064-3, under ANAB accreditation to ISO 14065 and ISO 17029. It verifies against The Climate Registry, Climate Action Reserve and ACR programmes, and California ARB and LCFS requirements.

Why we listed them

Listed because the accreditation trail is public: ANAB accreditation to ISO 14065 held since 2008, with the verification standards named on their own service pages. An accreditation you can check against the register is the whole test.

We selected this listing ourselves. Nobody paid for it, and nothing was promised in exchange.

Compiled from their own published information in September 2026. We re-check listings annually. Tell us if anything here is out of date.

Listings are not recommendations, endorsements or an assurance of quality, and we do not verify providers’ claims. Nothing here influences our emission factors, methodology or calculator results.

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