> For the complete documentation index, see [llms.txt](https://open-carbon-protocol.gitbook.io/ocp-methodology-requirements/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://open-carbon-protocol.gitbook.io/ocp-methodology-requirements/context/ocp-sectors-and-sub-sectors.md).

# OCP Sectors and Sub-Sectors

<table><thead><tr><th width="141.0859375">Primary Sector</th><th>Secondary Sector</th><th width="215.9765625">Active Methodologies</th><th>In OCP Scope?</th></tr></thead><tbody><tr><td><strong>Waste</strong></td><td>Landfill Gas Emissions</td><td><mark style="color:green;">In Development</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Biomass Pyrolysis / Biochar</td><td><mark style="color:green;">In Development</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Fugitive Gas Destruction/Recovery</td><td><mark style="color:$success;">Approved:</mark><br>"<a href="https://pilot.ocp.earth/all-methodologies/9?roundId=23">HFC Destruction from Household Appliances in the U.S.</a>"<br><br><mark style="color:green;">In Public Commentary:</mark><br>"<a href="https://pilot.ocp.earth/public-commentary/4">Recovery and Destruction of Hydrofluorocarbon Refrigerant Gases in Article 5 Countries</a>"</td><td><strong>Yes</strong></td></tr><tr><td></td><td>Other</td><td><mark style="color:$info;">No</mark></td><td><mark style="background-color:yellow;">With Board Approval</mark></td></tr><tr><td><strong>Household Emissions</strong></td><td>Improved Cook Stoves</td><td><mark style="color:green;">In Development</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Enhanced Efficiency</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Home Waste Management (Recycling and Food Waste)</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Other</td><td><mark style="color:$info;">No</mark></td><td><mark style="background-color:yellow;">With Board Approval</mark></td></tr><tr><td><strong>Land Use</strong></td><td>Regenerative Agriculture</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Enhanced Terrestrial Weathering (incl. Enhanced Rock Weathering)</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>REDD+</td><td><mark style="color:$info;">No</mark></td><td><mark style="background-color:$danger;">No - Never</mark></td></tr><tr><td></td><td>Improved Forest Management (IFM)</td><td><mark style="color:$info;">No</mark></td><td><mark style="background-color:$danger;">No</mark></td></tr><tr><td></td><td>Afforestation, Reforestation, and/or Revegetation (ARR)</td><td><mark style="color:$info;">No</mark></td><td><mark style="background-color:$danger;">No</mark></td></tr><tr><td></td><td>Other</td><td><mark style="color:$info;">No</mark></td><td><mark style="background-color:yellow;">With Board Approval</mark></td></tr><tr><td><strong>Industrial Processes</strong></td><td>Nitrous Oxide Abatement</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Methane Abatement</td><td><mark style="color:green;">In Development</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Carbon Dioxide Abatement</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Other GHG Abatement</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Synthetic Direct Air Capture</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Enhanced Efficiency</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Cement/Construction</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Oil or Gas Well Management</td><td><mark style="color:$success;">Approved:</mark><br>"<a href="https://pilot.ocp.earth/all-methodologies/3?roundId=7">Early Decommissioning of Marginal Oil and Gas Wells in the United States</a>"<br><br>"<a href="https://pilot.ocp.earth/all-methodologies/8?roundId=26">Plugging Orphaned Oil and Gas Wells in the United States</a>"</td><td><strong>Yes</strong></td></tr><tr><td></td><td>Other</td><td><mark style="color:$info;">No</mark></td><td><mark style="background-color:yellow;">With Board Approval</mark></td></tr><tr><td><strong>Ocean</strong></td><td>Ocean Alkalinity Enhancement</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Organism Cultivation</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Mangroves</td><td><mark style="color:$info;">No</mark></td><td><mark style="background-color:$danger;">No</mark></td></tr><tr><td></td><td>Electrochemical Ocean Capture</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Ecosystem Restoration</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Other</td><td><mark style="color:$info;">No</mark></td><td><mark style="background-color:yellow;">With Board Approval</mark></td></tr><tr><td><strong>Transport</strong></td><td>Vehicle Alternatives</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Fuel Alternatives</td><td><mark style="color:$info;">No</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Enhanced Efficiency</td><td><mark style="color:green;">In Development</mark></td><td><strong>Yes</strong></td></tr><tr><td></td><td>Other</td><td><mark style="color:$info;">No</mark></td><td><mark style="background-color:yellow;">With Board Approval</mark></td></tr><tr><td><strong>Other</strong></td><td>Other</td><td><mark style="color:$info;">No</mark></td><td><mark style="background-color:yellow;">With Board Approval</mark></td></tr></tbody></table>