Reduction of Enteric Methane (Feed)

Overview

VM0041 provides procedures to quantify reductions in enteric methane emissions from ruminant livestock achieved by introducing feed ingredients into animal diets. It is applicable globally and covers feed ingredients approved for animal use that have scientific evidence of efficacy in suppressing methane formation during digestion. The methodology sets out how project proponents establish the enteric methane emission reduction factor. Each credit, issued as a Verified Carbon Unit, represents one tonne of carbon dioxide equivalent reduced.

Sources: methodology document · Verra Verified Carbon Standard

01 · Roles

The workflow as an explicit directed graph. In Graph each column is one role, so you can see who acts at each step; every node names the org.broadlistening.policy.block.* def it resolves to plus its input and output record. Data flow switches to a lineage view that makes explicit what data each node needs and makes, with dependency arcs tracing every record back to the node that produced it. Hover to trace, click to inspect; revise edges (dashed) send work back.

03 · Generated lexicon records

The records this methodology compiles to, ready to write to a PDS. The first tabs are the new policy engine records; the ★ claim.activity tab and those after it are reused ATProto Collective Funding Ecosystem records (org.hypercerts.*): the issued hypercert batch, its rights, an example verification attachment and a retirement receipt.

{
  "$type": "org.broadlistening.policy.methodology",
  "code": "VM0041",
  "name": "Reduction of Enteric Methane (Feed)",
  "registry": "Verra Verified Carbon Standard (VCS)",
  "sector": "Livestock",
  "creditType": "reduction",
  "status": "active",
  "version": "1.0",
  "roles": [
    {
      "id": "registry",
      "name": "Standard Registry",
      "permission": "Owns the policy, approves participants, anchors each issuance to its evidence."
    },
    {
      "id": "proponent",
      "name": "Project Proponent",
      "permission": "Registers the project and submits monitoring reports."
    },
    {
      "id": "vvb",
      "name": "Validation & Verification Body",
      "permission": "Independently validates the design and verifies monitored data."
    }
  ],
  "schemas": [
    "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.broadlistening.policy.schema/vm0041-project-design",
    "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.broadlistening.policy.schema/vm0041-monitoring-report"
  ],
  "graph": "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.broadlistening.policy.graph/vm0041",
  "issuesAs": "org.hypercerts.claim.activity",
  "workScope": "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.hypercerts.workscope.cel/vm0041-scope",
  "rights": "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.hypercerts.claim.rights/vm0041-rights",
  "createdAt": "2025-01-01T00:00:00.000Z"
}

04 · Schemas

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