A new study reveals that during the Palaeocene-Eocene Thermal Maximum (PETM) about 56 million years ago, rivers played a key role in Earth's climate recovery. Intense warming accelerated soil erosion, and rivers carried carbon from land into the ocean, where it was buried in marine sediments. This natural process helped lower atmospheric carbon levels over thousands of years, acting as a stabilizing feedback loop. The findings suggest that most climate models may underestimate the long-term carbon storage capacity of this land-to-ocean transfer. Understanding how ancient Earth recovered from extreme warming could inform how we think about long-term carbon sequestration and natural climate buffers today. The study analyzed molecular fossils and climate model data to track the carbon burial rates. For those tracking carbon cycles and climate policy, this research highlights a natural mechanism that slowly removes carbon from the atmosphere. It does not offer a quick fix for current emissions, but it underscores the importance of protecting river systems and marine sediment processes as part of long-term climate stability.
