The GreenCalculus changelog is the public audit trail for every substantive change to our emissions calculators, methodology pages, the MasterBrain data layer, and platform infrastructure, logged day by day as it ships. Each entry records what changed, the old and new values, and the governing source (GHG Protocol, IPCC AR6, DEFRA 2025, PCAF, and others), so practitioners can trace any factor back to its standard and edition.
Entries are authored by Jeremiah Say and verified by the GreenCalculus Engineering pipeline before publication. Subscribe to the RSS feed to track factor source updates. Spotted an error? Email jeremiah@greencalculus.com — corrections are credited by name in the next entry.
- v6.589.0 → 6.607.0PluginMinor
14 August 2026
Every figure now says what kind of activity it measures, and what a financial reporter needs to know about it. Anyone assessing data quality — a bank reporting financed emissions, an auditor,…
- v2026.127 → 2026.136Data layerMinor
14 August 2026 · Data layer
Factor lookups now return what kind of activity each figure measures, and how representative it is. The information was already implicit in every figure — its unit says what you multiply, its…
- v2026.111 → 2026.127Data layerMinor
13 August 2026 · Data layer
The second of the three places warming-potential figures were kept now reads them rather than storing them. The previous release did this for the public reference table. This does it for the…
- v6.562.0 → 6.589.0PluginMinor
13 August 2026
The check that authorises trimming a calculator's embedded data now identifies factors by their key rather than by guessing from the section name — which lets the personal footprint page shed another…
- v6.534.0 → 6.562.0PluginMinor
12 August 2026
The category index pages carried one-line descriptions too short to say what the section holds. • Each listing hub — calculators, glossary, methodology, standards, converters, data, topics, comparisons, factors, guides, tools and…
- v2026.110 → 2026.111Data layerMinor
10 August 2026 · Data layer
Added Canadian fuel emission factors from the Government of Canada's official reference. Seven new fuel factors for Canada were added: propane, ethane and butane (natural gas liquids), and light fuel oil, heavy…
- v6.482.0 → 6.534.0PluginMinor
10 August 2026
Directory listings can now be bought and filled in without us in the loop. • The buttons on /directory/ now open Stripe checkout — $390 a year or $39 a month. •…
- v6.465.0 → 6.482.0PluginMinor
9 August 2026
Headings across the site now use the Playfair Display serif, and the accent green is unified so every page matches the homepage. • Every article, calculator, glossary, standard, dataset and hub page…
- v6.445.0 → 6.465.0PluginMinor
8 August 2026
Table footnotes and unit labels on twelve dataset pages, restored. • Consolidating the dataset pages onto one shared stylesheet removed each page's private copy. Two small styles were in those copies and…
- v2026.107 → 2026.110Data layerMinor
8 August 2026 · Data layer
US spend-based factors were labelled with the wrong IPCC warming-potential edition. Corrected. Every emission factor records which IPCC edition of global warming potentials was used to combine the individual gases into a…
- v6.409.0 → 6.430.0PluginMinor
7 August 2026
The glossary is now a library you can browse, not just a list. • THE GLOSSARY PAGE IS NOW A DIRECTORY. The 213 terms are grouped into topics — accounting foundations, emissions…
- v2026.105 → 2026.107Data layerMinor
6 August 2026 · Data layer
The source record for the UK intensities now states the right unit. Yesterday's correction fixed the eighteen UK industry figures. This fixes the record describing where they come from, which still carried…
- v6.389.0 → 6.409.0PluginMinor
6 August 2026
The UK industry intensities can now be downloaded whole. • THE UK SPEND-BASED INTENSITIES ARE NOW A DOWNLOAD — 18 figures for how much greenhouse gas is emitted per pound of output,…
- v2026.104 → 2026.105Data layerMinor
5 August 2026 · Data layer
Added how much energy a kilogram of hydrogen holds. To give the forthcoming hydrogen converter a cited figure, we added hydrogen's two calorific values: 141.781 gigajoules per tonne gross, and 119.953 net…
- v6.376.0 → 6.389.0PluginMinor
5 August 2026
Four new converters, and eleven planned ones dropped after review. • ADDED — coal to oil equivalent, electric-car efficiency between the two conventions, building carbon intensity between square metres and square feet,…
- v6.367.0 → 6.376.0PluginMinor
4 August 2026
New converter: kWh to kilocalories. • ADDED — one registry row, kwh-to-kcal. One kilowatt-hour is 859.85 kilocalories. Bidirectional, so it also answers the reverse: a kilocalorie is 0.001163 kWh, and a gigacalorie…
- v6.357.0 → 6.367.0PluginMinor
3 August 2026
New converter: kWh to BTU. • ADDED — one registry row, kwh-to-btu. One kilowatt-hour is 3,412.14 BTU, the familiar 3,412. Bidirectional, so it also answers the reverse: 1,000 BTU = 0.2931 kWh.…
- v2026.102 → 2026.104Data layerMinor
3 August 2026 · Data layer
Added how much methane one part per billion in the air weighs. To give the new /convert/ppb-methane-to-megatonnes/ converter a cited factor, we added atmospheric.ch4.tg_per_ppb = 2.75 teragrammes of methane per part per…
- v2026.97 → 2026.102Data layerMinor
1 August 2026 · Data layer
Added the carbon footprint of an apparel item. To give the new /convert/co2e-to-apparel-items/ converter a cited factor, we added equivalencies.ref.apparel_item = 0.007 metric tonnes CO2e per item — a cotton T-shirt on…
- v6.332.0 → 6.357.0PluginMinor
1 August 2026
Related-posts cascade now includes the converter CPT. • WHY — /convert/ pages were absent from gc_get_all_reference_cpts(), the allow-list the [gc_related_posts] cascade filters candidates against. A converter's related grid therefore could not surface…
- v6.322.0 → 6.332.0PluginMinor
31 July 2026
New converter: CO₂e to Coal Burned (roadmap #88). • NEW CONVERTER — co2e-to-coal-burned registry row (type mb, category equivalencies). Reads equivalencies.usa.coal_pound (= 0.0009 t CO₂ per pound of coal burned, US power…
- v2026.89 → 2026.97Data layerMinor
31 July 2026 · Data layer
Added R-450A refrigerant blend global warming potential. To give the new /convert/r-450a-to-co2e/ converter a cited factor, we added the AR6 100-year GWP of 643 for R-450A (Solstice N13), an A1 non-flammable HFC/HFO…
- v6.316.0 → 6.322.0PluginMinor
30 July 2026
New converter: R-507A to CO₂e (roadmap #77). • NEW CONVERTER — r-507a-to-co2e registry row (type mb, category gwp-gas-to-co2e). Reads gwp.HFC_507A.ar6_100 (= 4,775, AR6) live from MasterBrain with an AR6/AR5 basis toggle (AR5…
- v2026.84 → 2026.89Data layerMinor
30 July 2026 · Data layer
Added R-507A refrigerant blend global warming potential values. To give the new /convert/r-507a-to-co2e/ converter a cited factor, we added two rows: the AR6 100-year GWP of 4,775 and the AR5 comparison value…
- v6.310.0 → 6.316.0PluginMinor
29 July 2026
New converter: kg C₄F₁₀ (PFC-3-1-10) to CO₂e (roadmap #71). • NEW CONVERTER — kg-c4f10-to-co2e registry row (type mb, category gwp-gas-to-co2e). Reads gwp.PFC_C4F10.ar6_100 (= 10,000, AR6) live from MasterBrain with an AR6/AR5 basis…