Yorkshire Philosophical Society

Event Information

“The collapse of tropical forests” during the Permian-Triassic Mass Extinction: new research

Dr. Zhen Xu (Jane), Research Fellow, University of Leeds

Image: Pre-extinction tropical seed fern with complex vein system

Abstract:

Although flowering plants had not yet evolved, equatorial regions in the late Permian were already covered by lush forests dominated by unusual plants called gigantopterids. Giant lycophyte trees up to 50 metres tall formed the canopy, while tree ferns, seed ferns, horsetail ancient relatives and some gymnosperms created complex and diverse ecosystems. This world collapsed during the Permian–Triassic Mass Extinction, triggered by massive volcanic eruptions. Our research shows that the loss of forests greatly reduced Earth’s ability to store carbon, leaving atmospheric CO2 high for millions of years and creating a prolonged “super-greenhouse” climate. This ancient event offers an important warning: if modern tropical forests collapse under rapid warming, the climate system could take geological timescales to recover.

We are holding this free Cafe Scientifique session on Wednesday 6 May 2026 with doors open from 7pm, talk starting at 7.30pm at City Screen Basement, Coney Street, YO1 9QL   Lift access available. No Booking necessary.

Please buy a drink in the basement bar, take your seats and be ready for a presentation and Q and A.