{"id":41195,"date":"2026-05-29T16:27:19","date_gmt":"2026-05-29T14:27:19","guid":{"rendered":"https:\/\/www.graviton.at\/letterswaplibrary\/i-built-an-open-version-controlled-emission-factor-dataset-aligned-to-ipcc-ar6-gwp-100-free-to-use-and-cite\/"},"modified":"2026-05-29T16:27:19","modified_gmt":"2026-05-29T14:27:19","slug":"i-built-an-open-version-controlled-emission-factor-dataset-aligned-to-ipcc-ar6-gwp-100-free-to-use-and-cite","status":"publish","type":"post","link":"https:\/\/www.graviton.at\/letterswaplibrary\/i-built-an-open-version-controlled-emission-factor-dataset-aligned-to-ipcc-ar6-gwp-100-free-to-use-and-cite\/","title":{"rendered":"I Built An Open, Version-controlled Emission Factor Dataset Aligned To IPCC AR6 GWP-100 \u2014 Free To Use And Cite"},"content":{"rendered":"<p><!-- SC_OFF --><\/p>\n<div class=\"md\">\n<p>I was building GreenCalculus (carbon accounting\/calculator platform \u2014 disclosure: it\u2019s my project) and kept running into the same problem:<\/p>\n<p>There\u2019s no single clean, open, version-controlled emission factor dataset aligned to IPCC AR6 GWP-100.<\/p>\n<p>The data exists, but it\u2019s scattered across:<\/p>\n<ul>\n<li>DEFRA<\/li>\n<li>EPA<\/li>\n<li>IEA<\/li>\n<li>IPCC PDFs<\/li>\n<\/ul>\n<p>\u2026with different units, different GWP vintages, and almost no visibility into what changed between versions.<\/p>\n<p>So I consolidated it into one open repo:<\/p>\n<p><a href=\"https:\/\/github.com\/greencalculus\/greencalculus-methodology\">https:\/\/github.com\/greencalculus\/greencalculus-methodology<\/a><\/p>\n<p>Everything is free, public, and downloadable. No signup, no API key.<\/p>\n<p>What\u2019s inside:<\/p>\n<ul>\n<li><code>gwp-values.json<\/code> AR6 + AR5 values side-by-side for 16 greenhouse gases.<\/li>\n<li><code>emission-factors.json<\/code> + <code>.csv<\/code> Scope 1 fuel combustion + Scope 2 electricity grid factors across 15 countries.<\/li>\n<li><a href=\"http:\/\/methodology.md\/\"><code>METHODOLOGY.md<\/code><\/a> Full calculation methodology with formulas + source references.<\/li>\n<li><code>CITATION.cff<\/code> Makes it easy to cite in BibTeX \/ APA.<\/li>\n<\/ul>\n<p>One thing I think carbon accounting software gets wrong:<\/p>\n<p>Emission factors should behave like versioned code dependencies.<\/p>\n<p>If a methane GWP changes, you should be able to diff it, trace it, and reproduce historical outputs exactly.<\/p>\n<p>Git is honestly a better audit trail than most ESG software I\u2019ve seen.<\/p>\n<p>Interesting migration issue I noticed while compiling this:<\/p>\n<p>A lot of inventories still use older methane GWPs.<\/p>\n<ul>\n<li>AR4 CH4 = 25<\/li>\n<li>AR5 CH4 = 28<\/li>\n<li>AR6 fossil CH4 = 29.8<\/li>\n<\/ul>\n<p>So moving from AR4 \u2192 AR6 increases fossil methane impact by ~19% using the exact same activity data.<\/p>\n<p>Even AR5 \u2192 AR6 is still about +6%.<\/p>\n<p>PRs\/corrections are genuinely welcome.<\/p>\n<p>And if you just want to calculate emissions instead of building your own model:<\/p>\n<p><a href=\"https:\/\/greencalculus.com\/calculators\/\">https:\/\/greencalculus.com\/calculators\/<\/a><\/p>\n<p>Happy to answer methodology questions or discuss factor provenance\/versioning.<\/p>\n<\/div>\n<p><!-- SC_ON -->   submitted by   <a href=\"https:\/\/www.reddit.com\/user\/greencalculus\"> \/u\/greencalculus <\/a> <br \/> <span><a href=\"https:\/\/www.reddit.com\/r\/datasets\/comments\/1tr3guk\/i_built_an_open_versioncontrolled_emission_factor\/\">[link]<\/a><\/span>   <span><a href=\"https:\/\/www.reddit.com\/r\/datasets\/comments\/1tr3guk\/i_built_an_open_versioncontrolled_emission_factor\/\">[comments]<\/a><\/span><\/p><div class='watch-action'><div class='watch-position align-right'><div class='action-like'><a class='lbg-style1 like-41195 jlk' href='javascript:void(0)' data-task='like' data-post_id='41195' data-nonce='72e055e984' rel='nofollow'><img class='wti-pixel' src='https:\/\/www.graviton.at\/letterswaplibrary\/wp-content\/plugins\/wti-like-post\/images\/pixel.gif' title='Like' \/><span class='lc-41195 lc'>0<\/span><\/a><\/div><\/div> <div class='status-41195 status align-right'><\/div><\/div><div class='wti-clear'><\/div>","protected":false},"excerpt":{"rendered":"<p>I was building GreenCalculus (carbon accounting\/calculator platform \u2014 disclosure: it\u2019s my project) and kept running into the&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[85],"tags":[],"class_list":["post-41195","post","type-post","status-publish","format-standard","hentry","category-datatards","wpcat-85-id"],"_links":{"self":[{"href":"https:\/\/www.graviton.at\/letterswaplibrary\/wp-json\/wp\/v2\/posts\/41195","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.graviton.at\/letterswaplibrary\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.graviton.at\/letterswaplibrary\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.graviton.at\/letterswaplibrary\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.graviton.at\/letterswaplibrary\/wp-json\/wp\/v2\/comments?post=41195"}],"version-history":[{"count":0,"href":"https:\/\/www.graviton.at\/letterswaplibrary\/wp-json\/wp\/v2\/posts\/41195\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.graviton.at\/letterswaplibrary\/wp-json\/wp\/v2\/media?parent=41195"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.graviton.at\/letterswaplibrary\/wp-json\/wp\/v2\/categories?post=41195"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.graviton.at\/letterswaplibrary\/wp-json\/wp\/v2\/tags?post=41195"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}