Climate Change Evidence
There were major glaciations at the beginning of the Ordovician and Devonian ME’s.
No major glaciations accompanied the Permian, Triassic and Cretaceous ME’s.
Another major glaciation, ca. 300 million years ago, and lasting 90 million yrs, did not result in an ME.
Tentative Conclusion: glaciations might cause extinctions in marine invertebrates, but are not currently regarded as a necessary cause for ME’s.