Data

913 published companies in release 2026-11.4 (data as of 2026-11-05), out of 1,470 active companies in the database. Published means: active, and a supplier, a corporate division, an ecosystem company (MRV, brokers, software) or a side business. Buyers, entries under review, academic institutions and companies whose only pathway is afforestation stay in the database but are not published. 403 of the published companies are based in Europe (EU27 plus UK, Switzerland, Norway, Iceland). ...

55,865 researchers listed in release 2026-11.4 (data as of 2026-11-05): every author with at least one CDR-relevant paper since 2021 on one of 6 pathways, from 15,896 papers, 11,015 institutions and 170 countries. The calibrated estimate of the real population is 51,946: the listed count scaled per country by the precision and recall measured in the March 2026 calibration sample (OpenAlex over-assigns some countries and misses others). 11,214 listed researchers are based in Europe. ...

14 shops in release 2026-11.4 (data as of 2026-11-05): every shop I know of where a person can buy certified carbon removal with a live credit-card checkout, listed on cdr-shops.com with price, method, certifier, delivery time and ratings for MRV, certification and delivery. ...

Newest first. A release covers all three datasets and stays available under /data/v1/<version>/; the newest is also under /data/v1/latest/. Entries before the first release are the version history of the researcher census (launched 18 March 2026); “Census refresh” rows are the monthly database updates on the 11th, which feed the release around the 15th. Corrections between releases are noted here and applied in the next release. Date Version Dataset What changed 2026-11-05 2026-11.4 All Release 2026-11.4, the first public release (5 November 2026): 913 published companies (1,470 monitored), 55,865 researchers (calibrated estimate 51,946), 14 shops; six pathway top lists, two lists each (most active, most cited). Scope: high-permanence pathways only. Soil carbon research is not published (it held 42,911 of the 95,329 researchers listed internally in October, mostly agricultural soil science); General CDR counts a paper only when it carries no other pathway tag and is labelled Cross-cutting CDR; companies whose only pathway is afforestation are not published. 2026-11-05 2026-11.4 Companies First release: 913 published companies from 65 countries; largest pathways Biochar 377, Enabling Tech 179, DAC 125, BECCS 84. 2026-11-05 2026-11.4 Researchers First release: 55,865 researchers listed (calibrated estimate 51,946) from 15,896 papers; 6 pathway top lists. 2026-11-05 2026-11.4 Shops First release: 14 shops with a live checkout and third-party certification; prices in per tonne CO₂. 2026-10-11 Census refresh Researchers Monthly database refresh: 1,779 new papers discovered and classified, 2,669 new researchers (92,660 → 95,329); author metrics re-enriched. 2026-09-11 Census refresh Researchers Monthly database refresh: 1,348 new papers discovered and classified, 2,091 new researchers (90,569 → 92,660); author metrics re-enriched. 2026-08-11 Census refresh Researchers Monthly database refresh: 1,758 new papers discovered and classified, 1,861 new researchers (88,708 → 90,569); author metrics re-enriched. 2026-07-11 Census v3.4 Researchers Membership tightened: researchers without a single classified-relevant CDR paper are no longer counted or exported. Researchers 147,377 → 88,691. 2026-07-11 Census v3.3 Researchers Deterministic pathway tie-break: papers tagged with a specific pathway and General CDR assign the specific one. DAC 1,251 → 4,122 researchers; General CDR 18,066 → 11,123. 2026-07-11 Census v3.2 Researchers Tier-2 deduplication: 817 same-person author records merged on identical normalised names plus shared co-authors or institution, with common-name and ORCID-conflict guards. Researchers 148,194 → 147,377. 2026-07-11 Census v3.1 Researchers Deduplication and primary-works scope: 561 ORCID-split author records merged, 1,441 upstream-deleted IDs retired, 6,959 historical merges repaired; datasets, supplements, peer-review comments and errata no longer count as papers (−2,002). Researchers 150,203 → 148,194; papers 27,816 → 25,814. 2026-07-09 Census v3 Researchers Monthly refresh pipeline live. 8,328 new papers discovered since April, 3,067 classified CDR-relevant; all author metrics re-enriched; ORCID enrichment for 10,930 new researchers. Researchers 122,674 → 150,203; relevant papers 24,749 → 27,816. 2026-03-23 Census v2.1 Researchers Direct air capture classifier recalibrated: 1,312 DAC papers recovered (30 → 1,342 papers, 48 → 3,951 authors). 2026-03-23 Census v2 Researchers Every paper reclassified by title and abstract with a language model; 12,384 non-CDR papers removed (39,278 → 24,749). 11,237 authors left without a CDR paper. 2026-03-18 Census v1 Researchers Initial launch of the CDR Researcher Census: 122,674 authors, 39,278 papers, keyword-based pathway classification.

The 100 most active researchers in BECCS since 2021, worldwide, the 50 most active based in Europe, and the same two lists by citations, from the CDR Researcher Census release 2026-11.4 (data as of 2026-11-05). 4,134 researchers have at least one CDR paper in this pathway since 2021; 66 of the most active 100 are based in Europe. Jump to: most active, world · most active, Europe · most cited, world · most cited, Europe. ...

The 100 most active researchers in Biochar since 2021, worldwide, the 50 most active based in Europe, and the same two lists by citations, from the CDR Researcher Census release 2026-11.4 (data as of 2026-11-05). 27,613 researchers have at least one CDR paper in this pathway since 2021; 27 of the most active 100 are based in Europe. Jump to: most active, world · most active, Europe · most cited, world · most cited, Europe. ...

The 100 most active researchers in Cross-cutting CDR since 2021, worldwide, the 50 most active based in Europe, and the same two lists by citations, from the CDR Researcher Census release 2026-11.4 (data as of 2026-11-05). 12,831 researchers have at least one CDR paper in this pathway since 2021; 65 of the most active 100 are based in Europe. Jump to: most active, world · most active, Europe · most cited, world · most cited, Europe. ...

The 100 most active researchers in DAC since 2021, worldwide, the 50 most active based in Europe, and the same two lists by citations, from the CDR Researcher Census release 2026-11.4 (data as of 2026-11-05). 6,029 researchers have at least one CDR paper in this pathway since 2021; 39 of the most active 100 are based in Europe. Jump to: most active, world · most active, Europe · most cited, world · most cited, Europe. ...

The 100 most active researchers in Enhanced Weathering since 2021, worldwide, the 50 most active based in Europe, and the same two lists by citations, from the CDR Researcher Census release 2026-11.4 (data as of 2026-11-05). 4,944 researchers have at least one CDR paper in this pathway since 2021; 65 of the most active 100 are based in Europe. Jump to: most active, world · most active, Europe · most cited, world · most cited, Europe. ...

The 100 most active researchers in Ocean CDR since 2021, worldwide, the 50 most active based in Europe, and the same two lists by citations, from the CDR Researcher Census release 2026-11.4 (data as of 2026-11-05). 5,665 researchers have at least one CDR paper in this pathway since 2021; 60 of the most active 100 are based in Europe. Jump to: most active, world · most active, Europe · most cited, world · most cited, Europe. ...