Durable CDR Quality Tiers
Practical buyer framing for biochar and peer durable CDR—not a formal rating agency scale. Grounded in how registries and ICVCM labels differ as of 2026-09-14. Cross-links: Buyers and Offtakes · Market Volumes and Pricing · Risks and Controversies · Permanence Science for Credits.
Why tiers matter commercially
CDR.fyi and corporate statements repeatedly cite integrity, durability, scalability, and co-benefits as purchase screens (e.g., Swiss Re, SEB, Nasdaq narratives in the Biochar Snapshot 2025). Price discovery is incomplete (few disclosed $/t on megadeals), so quality signalling often substitutes for transparent indexes outside Puro CORCs (Price Indexes and Benchmarks).
Practical tier table
| Tier | Typical claim | Horizon / issuance style | Biochar examples | Buyer implication |
|---|---|---|---|---|
| A — Durable engineered CDR (high-integrity registries) | Net atmospheric CO₂ stored; ex-post; LCA + third-party audit | Multi-century to millennial; unique serials; retirement | Puro CORC200+; Isometric Biochar Protocol 200y / 1000y; CSI Global Biochar C-Sink GPC; Verra VM0044 CCP-labeled VCUs | Eligible for serious corporate neutralization portfolios; diligence still required on feedstock & delivery |
| B — Durable but label-incomplete / transitional | Same physics claim, weaker or pending integrity label | Same science stack; program or method awaiting CCP category approval | Puro program CCP-Eligible (2025-12-11) while biochar methodology not yet CCP-Approved (ICVCM); Edition 2022 CORC100+ wind-down | Some buyers accept; CCP-sensitive RFPs may prefer VM0044 until Puro biochar CCP completes |
| C — Temporary / semi-persistent C accounting | Time-bounded storage metrics or decay pools | ≤1000y SPC-style or short CINK products | CSI SPC / related temporary products (see CSI Global Biochar C-Sink) | Not interchangeable with permanent-removal claims without disclosure |
| D — Conventional VCM offsets | Avoidance or short-lived sequestration | Project-dependent | Non-removal forestry/RE credits sold as “offsets” | Not equivalent to BCR CDR (Biochar as Durable CDR) |
| E — Uncertified marketing claims | “Carbon-negative” product copy without unique retirement | No registry serial | Fertilizer / soil-product marketing without CORC/VCU/C-sink retirement | High Risks and Controversies / greenwashing risk |
Integrity labels that move price / preference (public)
| Label | Status relevant to biochar (research date) | Source |
|---|---|---|
| ICVCM CCP — methodology | Verra VM0044 v1.2 CCP-Approved (Board 2025-07-24) — methodology | ICVCM PDF |
| ICVCM CCP — program | Puro General Rules v4.2+ CCP-Eligible; biochar method assessment separate | ICVCM 2025-12-11 |
| ICROA / CORSIA claims | Program-dependent (Isometric claims on protocol pages; verify live) | Isometric Biochar Protocol |
| EU CRCF “permanent removal” | Delegated Reg. (EU) 2026/285; geographic/activity rules | EUR-Lex · Key Sources |
Whether CCP labels raise bilateral prices is not publicly quantified in CDR.fyi abridged posts—treat as a segmentation hypothesis, not a measured premium.
Permanence science vs commercial tiers
Commercial durability claims map to science stacks:
- 100-year inventory style: IPCC appendix; Verra VM0044 Table 3 (H/C_org) — CDR Potential and IPCC Accounting · Verra VM0044
- Several centuries / CORC200+: Puro Edition 2025 power-law — Puro CORC200+ · Puro Biochar Methodology Edition 2025
- 200y or 1000y (Ro path): Isometric modules — Isometric Biochar Protocol
- GPC >1000y vs SPC: CSI — CSI Global Biochar C-Sink
Debates: Consensus vs Debates · Permanence · Permanence Science for Credits.
Delivery quality (often under-weighted)
Buyers increasingly price near-term deliverability alongside permanence (Supercritical/Exomad Apr 2026 narrative; CDR.fyi “promise to proof”). A Tier-A method with weak operational delivery underperforms a Tier-A method with proven tonnes—see delivery ratios in Market Volumes and Pricing and supplier track records in Supply Landscape.
Gaps
- No public, standardized BCR “grade” across registries.
- Limited disclosed price differentials by tier.
- dMRV platforms (e.g., Carbonfuture) appear in megadeal contracts but are not themselves a registry grade.
Primary links
- CDR.fyi Biochar Snapshot 2025
- Verra VM0044 v1.2
- ICVCM M43 VM0044
- ICVCM Puro CCP-Eligible
- Isometric Biochar v1.3
- CSI Global Biochar C-Sink 3.3 PDF
See also
Historical Deals · Puro Pricing and CORC Indexes · Puro vs Other Standards · Carbon Markets Hub · Market Hub · Key Sources