Biodiversity
What forest restoration can and cannot do for carbon accounting
Restored forests store carbon slowly and reversibly. Researchers explain why permanence rules matter more than planted-tree counts.
By Marco Fielding · · 8 min read · Updated
Key takeaways
- Restored forests absorb carbon slowly, over decades rather than years.
- Storage is reversible: fire, drought, and land-use change can release it again.
- Permanence and monitoring rules matter more than the number of trees planted.
Why tree counts are a poor metric
A planted seedling stores almost no carbon. Meaningful sequestration begins years later and accumulates over decades, which means restoration cannot offset emissions that occur today on a like-for-like basis.
Survival rates vary widely by species, site preparation, and aftercare. Programmes that report planted trees rather than surviving biomass systematically overstate their climate contribution.
Permanence and reversal risk
Carbon stored in living biomass is reversible. Wildfire, pest outbreaks, drought, and later clearing can return it to the atmosphere. Credible accounting therefore uses buffer pools, long monitoring periods, and conservative baselines.
Regulators and standards bodies are converging on longer permanence horizons and independent remote-sensing verification, which raises the cost of low-quality projects and improves comparability.
Where restoration genuinely helps
Restoration delivers strong biodiversity, water, and soil benefits alongside carbon. Treated as an ecosystem investment rather than an emissions offset, it is one of the more reliable land-based interventions available.