New peer-reviewed research published in Biological Conservation underscores the urgent need to protect mature and old-growth (MOG) forests as one of the most powerful natural climate solutions in the U.S. Co-authored by Dr. Dominick A. DellaSala, Chief Scientist of Wild Heritage, and scientists from Woodwell Climate Research Center, the study—“How much more carbon could be protected in mature and old-growth forests of the United States?”—offers the first national estimate of how much carbon is stored in MOG forests, and how much more could be safeguarded through stronger forest protections.
Key Findings:
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Mature and old-growth forests store significantly more carbon per hectare than younger forests and continue absorbing carbon as they age.
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Only 18% of the carbon in MOG forests is currently protected.
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Protecting what remains—and allowing mature forests to grow into old growth—could prevent emissions equal to eight years of U.S. fossil fuel output.
This research makes it clear: mature and old-growth forests are a critical climate solution. Yet many remain vulnerable to logging, especially in areas like Inventoried Roadless Areas (IRAs), which lack permanent protection.
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👉Read the full study
This research underscores why science-based forest protections matter—and why Wild Heritage will continue working with partners, policymakers, and communities to defend the most climate-critical forests in the U.S.