Lee Kump, a professor in Penn State's Department of Geosciences, has been studying ancient climates based on the evidence left behind in marine sediments for most of his career. Watch this video below to see him explain some of his hypotheses about the end-Permian mass extinction and to hear more about his research.
In addition, here is a press release about Lee's hydrogen sulfide hypothesis:
- "Hydrogen Sulfide, Not Carbon Dioxide, May Have Caused Largest Mass Extinction," ScienceDaily (Nov. 5, 2003)
Here's the citation for the scientific paper:
- Kump, L.R., A. Pavlov, and M.A. Arthur, 2005, Massive release of hydrogen sulﬁde to the surface ocean and atmosphere during intervals of oceanic anoxia, Geology 33, 397–400.