COAS-Eligible Urban Forest Preservation Credits

The programme quantifies and verifies avoided emissions from PSHB-related tree death and preserves future sequestration over extended survival horizons.

Baseline

No intervention

Infected trees die within ~10 years. Stored carbon is released and sequestration stops.

Project

With intervention

Treated trees survive 40–100 years, keeping carbon stored and continuing annual uptake.

Crediting

Conservative MRV

GIS registry, DBH/species allometry, survival verification, and buffer pooling.

COAS Pathway

1. Baseline inventory

Tree registry + boundary

2. Methodology

Adapt urban preservation protocol

3. Validation

Independent third-party review

4. Verification

Annual issuance + COAS listing

Integrity Safeguards

Additionality

Credits only claimed where baseline mortality is demonstrably likely and treatment changes outcomes.

Permanence

Survival monitoring, retreatment schedules, and a conservative reversal buffer pool (10–15%).