# Source Registry

## Upstream Source Registry

The Cleantech Taxonomy v1.0 is built on four openly available institutional sources, each serving a different layer of the classification. This page tracks their versions, update cycles, and access points.

<table id="bkmrk-%23sourceroleversionli"><tr><th>\#</th><th>Source</th><th>Role</th><th>Version</th><th>License</th><th>Update Cycle</th><th>Wiki Book</th></tr><tr><td>01</td><td>**CPI Global Landscape of Climate Finance**</td><td>Primary sector structure (9 sectors, mitigation + adaptation)</td><td>GLCF 2025 (July 2025)</td><td>CC BY-NC-SA 4.0</td><td>Annual (July)</td><td>Book 01 (id=878)</td></tr><tr><td>02</td><td>**EU Taxonomy for Sustainable Activities**</td><td>Regulatory &amp; finance eligibility crosswalk</td><td>2026 draft revision (March 2026)</td><td>EU law (open)</td><td>Delegated acts (irregular)</td><td>Book 02 (id=879)</td></tr><tr><td>03</td><td>**IEA Energy Technology Classification System**</td><td>Energy sector depth — technology-level classification</td><td>ETP 2025</td><td>Open (IEA)</td><td>Annual (ETP cycle)</td><td>Book 03 (id=880)</td></tr><tr><td>04</td><td>**Climate Bonds Initiative Taxonomy**</td><td>Bond/instrument eligibility — 50+ national taxonomies</td><td>Current (ongoing updates)</td><td>Open</td><td>Sector criteria updated rolling</td><td>Book 04 (id=881)</td></tr><tr><td>EXT</td><td>**CTH Extensions**</td><td>LATAM gaps — NbS, informal economy, EUDR supply chain</td><td>v1.0 (May 2026)</td><td>CC BY 4.0</td><td>CTH-maintained</td><td>Book 07 (id=884)</td></tr></table>

## Monitoring

The `origo-taxonomy-watcher.py` script runs monthly on the CTH VPS (systemd timer: `origo-watcher.timer`) and checks all upstream URLs for content changes. Watch Reports are posted automatically to this book.

## Access Points

- **CPI:** [GLCF 2025 publication page](https://www.climatepolicyinitiative.org/publication/global-landscape-of-climate-finance-2025/)
- **EU Taxonomy:** [EU Taxonomy Compass](https://finance.ec.europa.eu/sustainable-finance/tools-and-standards/eu-taxonomy-sustainable-activities_en)
- **IEA:** [ETP Clean Energy Technology Guide](https://www.iea.org/data-and-statistics/data-tools/etp-clean-energy-technology-guide)
- **CBI:** [CBI Taxonomy page](https://www.climatebonds.net/expertise/taxonomy)

## Version History

<table id="bkmrk-datesourceevent-2026"><tr><th>Date</th><th>Source</th><th>Event</th></tr><tr><td>2026-05-26</td><td>All</td><td>Cleantech Taxonomy v1.0 baseline — all 4 sources indexed</td></tr></table>