--- title: Proba Registry description: Discover Proba Registry, where Inset Units ensure transparency in carbon reduction and support your net-zero goals through verified methodologies and streamlined processes. --- [![Proba. In your supply chain, we make the voluntary carbon market work for you.](https://proba.earth/hs-fs/hubfs/positive.png?width=185&height=53&name=positive.png "Proba. In your supply chain, we make the voluntary carbon market work for you.")](https://proba.earth?hsLang=en) Search toggle - Use cases Use cases - [Quantify fertilizer emissions](https://proba.earth/quantify-fertilizer-emissions-proba) - [Certify reductions](https://proba.earth/certify-emission-reductions) - [Design projects](https://proba.earth/design-sustainability-projects) - [Connect to buyers](https://proba.earth/connect-to-buyers) - [Scope 3 progress](https://proba.earth/report-scope-3-progress) - [For food companies](https://proba.earth/for-food-companies) - [For commodity traders](https://proba.earth/commodity-trader) - [For agricultural co-ops](https://proba.earth/agri-cooperatives) - [For fertilizer producers](https://proba.earth/for-fertilizer-producers) - Products Products - [MRV Platform](https://proba.earth/mrv-platform) - [GHG Methodologies](https://proba.earth/methodologies) - [Inset Units](https://proba.earth/inset-units) - [Registry](https://proba.earth/registry) - [All Proba products](https://proba.earth/products) - Services Services - [Implementation services](https://proba.earth/implementation-services) - [Proba Projects](https://proba.earth/proba-projects) - [Proba Quick scan](https://proba.earth/fertilizer-emission-calculator) - Resources Resources - [Blog](https://proba.earth/probas-blog) - [Proba Standard](https://proba.earth/proba-standard) - [Public Consultation](https://proba.earth/public-consultation) - [Approved VVBs](https://proba.earth/approved-vvbs) - Company Company - [About us](https://proba.earth/about-proba) - [Contact us](https://proba.earth/contact) - [Governance](https://proba.earth/proba-governance) - [Privacy policy](https://proba.earth/proba-privacy-policy) [Follow us on Facebook](https://www.linkedin.com/company/proba-earth/) [![Proba. In your supply chain, we make the voluntary carbon market work for you.](https://proba.earth/hs-fs/hubfs/positive.png?width=185&height=53&name=positive.png "Proba. In your supply chain, we make the voluntary carbon market work for you.")](https://proba.earth?hsLang=en) - Use cases Use cases - [Quantify fertilizer emissions](https://proba.earth/quantify-fertilizer-emissions-proba) - [Certify reductions](https://proba.earth/certify-emission-reductions) - [Design projects](https://proba.earth/design-sustainability-projects) - [Connect to buyers](https://proba.earth/connect-to-buyers) - [Scope 3 progress](https://proba.earth/report-scope-3-progress) - [For food companies](https://proba.earth/for-food-companies) - [For commodity traders](https://proba.earth/commodity-trader) - [For agricultural co-ops](https://proba.earth/agri-cooperatives) - [For fertilizer producers](https://proba.earth/for-fertilizer-producers) - Products Products - [MRV Platform](https://proba.earth/mrv-platform) - [GHG Methodologies](https://proba.earth/methodologies) - [Inset Units](https://proba.earth/inset-units) - [Registry](https://proba.earth/registry) - [All Proba products](https://proba.earth/products) - Services Services - [Implementation services](https://proba.earth/implementation-services) - [Proba Projects](https://proba.earth/proba-projects) - [Proba Quick scan](https://proba.earth/fertilizer-emission-calculator) - Resources Resources - [Blog](https://proba.earth/probas-blog) - [Proba Standard](https://proba.earth/proba-standard) - [Public Consultation](https://proba.earth/public-consultation) - [Approved VVBs](https://proba.earth/approved-vvbs) - Company Company - [About us](https://proba.earth/about-proba) - [Contact us](https://proba.earth/contact) - [Governance](https://proba.earth/proba-governance) - [Privacy policy](https://proba.earth/proba-privacy-policy) Search toggle [![Proba. In your supply chain, we make the voluntary carbon market work for you.](https://proba.earth/hs-fs/hubfs/positive.png?width=185&height=53&name=positive.png "Proba. In your supply chain, we make the voluntary carbon market work for you.")](https://proba.earth?hsLang=en) - Use cases Use cases - [Quantify fertilizer emissions](https://proba.earth/quantify-fertilizer-emissions-proba) - [Certify reductions](https://proba.earth/certify-emission-reductions) - [Design projects](https://proba.earth/design-sustainability-projects) - [Connect to buyers](https://proba.earth/connect-to-buyers) - [Scope 3 progress](https://proba.earth/report-scope-3-progress) - [For food companies](https://proba.earth/for-food-companies) - [For commodity traders](https://proba.earth/commodity-trader) - [For agricultural co-ops](https://proba.earth/agri-cooperatives) - [For fertilizer producers](https://proba.earth/for-fertilizer-producers) - Products Products - [MRV Platform](https://proba.earth/mrv-platform) - [GHG Methodologies](https://proba.earth/methodologies) - [Inset Units](https://proba.earth/inset-units) - [Registry](https://proba.earth/registry) - [All Proba products](https://proba.earth/products) - Services Services - [Implementation services](https://proba.earth/implementation-services) - [Proba Projects](https://proba.earth/proba-projects) - [Proba Quick scan](https://proba.earth/fertilizer-emission-calculator) - Resources Resources - [Blog](https://proba.earth/probas-blog) - [Proba Standard](https://proba.earth/proba-standard) - [Public Consultation](https://proba.earth/public-consultation) - [Approved VVBs](https://proba.earth/approved-vvbs) - Company Company - [About us](https://proba.earth/about-proba) - [Contact us](https://proba.earth/contact) - [Governance](https://proba.earth/proba-governance) - [Privacy policy](https://proba.earth/proba-privacy-policy) [Follow us on Facebook](https://www.linkedin.com/company/proba-earth/) Search toggle What are you looking for? Search # Proba Registry ![Proba Registry large graphic](https://proba.earth/hubfs/Proba%20Registry%20large%20graphic.png "Proba Registry large graphic") Every Proba Inset Unit begins as a verified fertilizer emission reduction, quantified under our [science-based methodologies](https://proba.earth/methodologies?hsLang=en) and confirmed by independent third-party verification. An Inset Unit isn't a generic offset. It stays inside your supply chain. The registry tracks and traces each unit from issuance to retirement, linking it to the specific growers, products, and organizations it came from, so the reduction can be claimed where it happened: in your own Scope 3 inventory, not someone else's. That's what makes every unit in this registry auditable, traceable, and yours. [Access the Proba Registry here](https://registry.proba.earth/) - ### Understanding GHG Methodologies and Third-Party Verification & Validation Published: 20.08.2025 Reading time: 2 min [Read More: Understanding GHG Methodologies and Third-Party Verification & Validation](https://proba.earth/probas-blog/understanding-ghg-methodologies-and-third-party-verification-validation?hsLang=en) ![Blog featured image (8)](https://proba.earth/hs-fs/hubfs/Blog%20featured%20image%20(8).png?width=800&name=Blog%20featured%20image%20(8).png) - ### How to start a GHG Project: The step-by-step guide for Project Developers and Reporting Companies Published: 23.05.2025 Reading time: 5 min [Read More: How to start a GHG Project: The step-by-step guide for Project Developers and Reporting Companies](https://proba.earth/probas-blog/how-to-start-a-ghg-project-the-step-by-step-guide-for-project-developers-and-reporting-companies?hsLang=en) ![Blog featured image (27)-1](https://proba.earth/hs-fs/hubfs/Blog%20featured%20image%20(27)-1.png?width=800&name=Blog%20featured%20image%20(27)-1.png) - ### Scalable decarbonization: understanding insetting chain-of-custody and market based mechanisms Published: 01.04.2025 Reading time: 5 min [Read More: Scalable decarbonization: understanding insetting chain-of-custody and market based mechanisms](https://proba.earth/probas-blog/scalable-decarbonization-insetting?hsLang=en) ![Blog featured image (29)](https://proba.earth/hs-fs/hubfs/Blog%20featured%20image%20(29).png?width=800&name=Blog%20featured%20image%20(29).png) ![Subheading (5)](https://proba.earth/hs-fs/hubfs/Subheading%20(5).png?width=317&name=Subheading%20(5).png "Subheading (5)") [Laan van Kronenburg 14, 1183 AS Amstelveen](https://maps.app.goo.gl/aKif8v1k5m9h2zA37)   Food companies are asking for certified Scope 3 reductions. It starts with fertilizer. [Follow us on Facebook](mailto:hello@proba.earth) [Follow us on Facebook](https://www.linkedin.com/company/proba-earth/) Use cases [Quantify fertilizer emissions](https://proba.earth/quantify-fertilizer-emissions-proba?hsLang=en) [Certify reductions](https://proba.earth/certify-emission-reductions?hsLang=en) [Design projects](https://proba.earth/design-sustainability-projects?hsLang=en) [Connect to buyers](https://proba.earth/connect-to-buyers?hsLang=en) [Scope 3 progress](https://proba.earth/report-scope-3-progress?hsLang=en) [Food companies](https://proba.earth/for-food-companies?hsLang=en) [Commodity traders](https://proba.earth/agri-trader?hsLang=en) [Agricultural co-ops](https://proba.earth/agri-cooperatives?hsLang=en) [Fertilizer producers](https://proba.earth/for-fertilizer-producers?hsLang=en) Products [All Proba products](https://proba.earth/products?hsLang=en) [MRV Platform](https://proba.earth/mrv-platform?hsLang=en) [GHG Methodologies](https://proba.earth/methodologies?hsLang=en) [Inset units](https://proba.earth/inset-units?hsLang=en) [Registry](https://proba.earth/registry) [Fertilizer calculator](https://proba.earth/fertilizer-emission-calculator?hsLang=en) Services [Implementation services](https://proba.earth/implementation-services?hsLang=en) [Quick scan](https://proba.earth/fertilizer-emission-calculator?hsLang=en) Resources [Blog](https://proba.earth/probas-blog?hsLang=en) [Document library](https://proba.earth/document-library?hsLang=en) [Public consultation](https://proba.earth/public-consultation?hsLang=en) [Approved VVBs](https://proba.earth/approved-vvbs?hsLang=en) Company [About us](https://proba.earth/about-proba?hsLang=en) [Contact us](https://proba.earth/contact?hsLang=en) [Governance](https://proba.earth/proba-governance?hsLang=en) [Privacy policy](https://proba.earth/proba-privacy-policy?hsLang=en)