I build sites that turn public records into sourced, checkable answers. If a number can't be traced to its source, it doesn't ship.
GreenCalculus · GraciousQuotes · PerBowl · Toggle9 · LinkedIn · ORCID
Each site has its own page about my role there: what I check, how I check it, and where to report a mistake.
| Site | What it is | My page there |
|---|---|---|
| GreenCalculus | A database and API of carbon emission factors, each traced to its primary publication, with calculators that show where every number comes from. | Founder & Lead Systems Architect |
| GraciousQuotes | A quotes site I started in February 2020. My main job there is checking who really said each quote, showing the source, and logging corrections in public. | Founder & editor |
| PerBowl | Who really makes your dog and cat food? Brands traced to the companies and plants behind them, with FDA inspection and recall records and free same-day recall alerts. | Founder & editor |
| Toggle9 | Free calculators that show their working. No sign-up, and each tool is dated with when I last checked it against its sources. | Creator |
- Sourced, or it doesn't go up. Every factor, quote attribution, maker match or formula points back to where it came from.
- Doubt is shown, not hidden. A shaky attribution gets an honest label, a doubtful maker match is held back, and an unrecognised input fails visibly instead of returning a confident wrong answer.
- Mistakes are fixed in public. Corrections and changes are logged on each site, with dates.
- Machine-readable provenance. Structured data (JSON-LD) on every page says who made it, what it's based on and when it was last checked.
Most of what I publish openly is under the GreenCalculus organisation:
| Repository | What it is |
|---|---|
greencalculus-benchmark |
How wrong are LLMs about emission factors, and how often do they name the wrong source? Scored against sourced ground truth. |
gwp-basis-check |
Finds warming-potential tables that contradict the IPCC assessment report they name. |
greencalculus-calculator-demo |
Zero-dependency demos of production carbon calculators: Scope 1 combustion, SBTi targets, FLAG, PCAF, CBAM. |
greencalculus-mcp · greencalculus-sdk · langchain-greencalculus |
Ways to call the emission-factor API from AI agents, Python and JavaScript. |
greencalculus-standards · greencalculus-methodology · greencalculus-open-data |
Methodology, standards mapping and source licences, CC-BY-4.0. |
Carbon accounting standards I work with
Live reference pages are on greencalculus.com/standards.
Calculation: GHG Protocol Corporate Standard · Scope 2 Guidance · Scope 3 Standard · Land Sector and Removals · IPCC 2006 Guidelines
Science: IPCC AR6 GWP-100
Verification and product level: ISO 14064-1 · ISO 14067 · ISO 14040/14044 · BS EN 15978
Disclosure: CSRD / ESRS E1 · TCFD
Targets: SBTi Corporate Net-Zero · RE100
Regulatory factor sets: UK DEFRA / DESNZ · EU F-Gas Regulation 2024/573
- Software developer, data scientist and data analyst
- Singapore Institute of Technology graduate
- Former maths tutor, which is why my tools show their working
- Professional Guide to Sustainability Reporting (Tinto Group)
- Wikipedia contributor on GHG Protocol, IPCC AR6, life-cycle assessment and CSRD articles
Corrections, data questions and collaboration are all welcome. I read every message.
📧 jeremiah@greencalculus.com · 💼 LinkedIn · 🆔 Wikidata