I build high-precision, GHG Protocol-aligned calculation infrastructure. I'm the architect of GreenCalculus — the traceable reference layer for corporate carbon accounting, where every result resolves to a published emission factor and a named standard.
GreenCalculus.com — a carbon-calculator platform mapped against 16 active global standards, where the math is built to be checked, not just trusted.
- Master Brain data layer — a single, versioned, parity-tested source of truth for every emission factor, spanning IEA 2026 grid factors, DEFRA / DESNZ 2025, EPA eGRID, the ICE database, and AR6 + AR5 GWP values. The same factor feeds every calculator and the underlying API, so the numbers can't disagree with themselves.
- Calculation engine architecture — Vanilla JS, zero dependencies, modern CSS
@layer, fluidclamp()typography, JetBrains Mono withtabular-numsfor numerical stability. - Structured data —
WebApplication,Dataset,HowTo, andArticleJSON-LD across every calculator for machine-readable provenance. - An auditable trust layer — every calculator is backed by a methodology page and version-tracked references, with each value change logged in a public changelog.
The discipline is small; the principles are what matter.
- Traceability over trust. A number a sustainability lead can hand to an auditor — who can then follow it all the way back to the source factor and the standard — beats a number that's merely "close."
- One source of truth. Factors live in one versioned store, never copied into the calculators that consume them. A value change is a tracked, auditable event, not a find-and-replace.
- Fail-soft, never wrong-but-plausible. An unrecognised input degrades visibly. The one outcome a carbon tool must never produce is a confident, wrong answer.
I publish formal open-methodology documentation under the GreenCalculus organisation. All standard mappings are CC-BY-4.0 — free to cite, translate, and republish with attribution.
| Repository | Purpose |
|---|---|
greencalculus/greencalculus-standards |
Open methodology mapping for 16 global GHG accounting standards |
greencalculus/greencalculus-methodology |
Formal methodology, emission factor datasets, GHG Protocol alignment docs |
greencalculus/greencalculus-calculator-demo |
Open-source, zero-dependency calculator demos — Scope 1 combustion, SBTi targets, FLAG, PCAF financed emissions |
The full set of standards that underpin the GreenCalculus platform. Live reference pages on greencalculus.com/standards; open methodology mappings (where published) on GitHub under greencalculus/greencalculus-standards.
- GHG Protocol Corporate Standard — 2026 revision
- GHG Protocol Scope 2 Guidance — 2015; revision in progress (consultation closed Jan 2026)
- GHG Protocol Scope 3 Standard — 2011; Phase 1 revision update Mar 2026
- GHG Protocol Land Sector and Removals Standard — v1.0, effective 1 Jan 2027
- IPCC 2006 Guidelines for National GHG Inventories — with 2019 Refinement
- IPCC AR6 — 100-year Global Warming Potentials — AR6 (2021); AR7 timeline still disputed at IPCC
- ISO 14064-1 — organisation-level GHG quantification — 2018 (confirmed 2024)
- ISO 14067 — product carbon footprint — 2018 (confirmed 2024)
- ISO 14040 / 14044 — life cycle assessment — foundational LCA framework
- BS EN 15978 — embodied carbon in buildings — EN 15978-1 revision expected 2025–2026
- CSRD / ESRS E1 — Climate change — ESRS Set 1 as modified by Omnibus I (EU 2026/470)
- TCFD Recommendations — disbanded Oct 2023; monitoring with IFRS Foundation
- SBTi Corporate Net-Zero Standard — v1.2; v2 consultation closed Dec 2025
- RE100 — Technical Criteria — 2024 update
- UK DEFRA / DESNZ GHG Conversion Factors — 2025 v1
- EU F-Gas Regulation (EU) 2024/573 — in force March 2024; HFC phase-down to 2050
- Lead Systems Architect, GreenCalculus (Singapore)
- Singapore Institute of Technology alumnus
- Professional Guide to Sustainability Reporting (Tinto Group)
- Independent advisor on corporate GHG accounting infrastructure
Standards corrections · methodology collaboration · advisory on corporate GHG accounting infrastructure.
- 🌐 GreenCalculus.com — main platform
- 📚 GreenCalculus on GitHub — open methodology repos
- 👤 About · 💼 LinkedIn
- 📧 jeremiah@greencalculus.com
All open methodology work is published under CC-BY-4.0 — free to cite, translate, and republish with attribution.