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Mark Trexler

Founder — Climatographer

Methodology focus

Founder of Climatographer; designed the first voluntary carbon offset project in 1988 (Applied Energy Services / CARE Guatemala). Three decades of carbon market experience spanning industry, EPA advisory roles, and the Climate Web knowledge-base project. Most credible 'elder statesman' critic of the field.

Trellison / LedgerWell intersection. Historical credibility. Has seen every failure mode.

Affiliation
Climatographer
Role
Founder
Axis
Integrity Critics
Tier
Tier 1

Selected publications

Alignment with proof packs

Their methodology / roleProof-pack / Trellison fit
Historical knowledge of offset methodology failuresProof pack formalises the specific failure modes he has catalogued for 30+ years
Practitioner-credible framingTrexler's endorsement of a methodology signals to the older industry cohort

Collaboration concepts

Concept 1

Historical taxonomy of offset failure modes, operationalised as proof-pack negative checks

Collaborative publication turning Climatographer's failure catalogue into a proof-pack rule set.

Concept 2

Industry practitioner briefing series

Trellison-hosted webinar series with Trexler on 'how markets failed, and what a per-tonne evidentiary chain fixes.'

Concept 3

Advisory role on Trellison methodology board

Senior advisor position with compensated honorarium and full disclosure.

Outreach approach

A draft opening message previously appeared here. It has been withdrawn from publication and archived internally. No contact has been made. Outreach drafts are not published against a named individual prior to contact and clearance.

What we do not ask for

  • Endorsement of Trellison, LedgerWell, DaedArch, or any affiliated entity.
  • Exclusivity or first-look rights on research findings.
  • Unpaid labour. Any advisor role is compensated with a modest honorarium and disclosed on the record.
Disclosure: Compiled from public sources through April 2026. Inclusion does not imply endorsement, affiliation, or reciprocal interest. Corrections: About.

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