AI Insight
Research reveals that a significant increase in atmospheric CO2 levels approximately 56 million years ago led to widespread forest dieback during the Paleocene-Eocene Thermal Maximum. The study draws parallels between this ancient climate event and current rapid increases in atmospheric carbon dioxide, suggesting modern forests may face similar vulnerability to climate-driven collapse. The findings are based on fossil evidence showing extensive vegetation changes during this period of abrupt warming.
Why it matters
Understanding how ancient forests responded to rapid CO2 increases provides critical insights into how modern ecosystems might react to current climate change. This research could inform conservation strategies and help predict which forest types are most vulnerable to ongoing atmospheric changes.
Understand the Science
Nature, Published online: 13 August 2026; doi:10.1038/d41586-026-02544-y
A widespread dieback of forests due to climate change 56 million years ago has parallels with today.
Source: Ancient rise in CO<sub>2</sub> was catastrophic for forests: what that means for today’s plants