Scientists argue climate crisis caused 6th mass extinction 233 million years ago

The ongoing Holocene extinction is often referred to as the Earth's potential sixth mass extinction, but a new study claims it would actually be the seventh if that prediction comes to fruition.

Authors of the study, published Wednesday in Science Advances, suggests the Carnian Pluvial Episode, a mysterious time of sudden climate and environmental change in the Late Triassic some 233 million, was "clearly a mass extinction," adding to the "big five" over the past 500 million years that have already been recorded. A team of scientists reviewed geological evidence and the fossil record, The Guardian reports, coming to the conclusion that enormous volcanic eruptions occurred at the same time as a global loss of plants and animals.

One of the scientists who worked on the project, Jacopo Dal Corso, said there is evidence the volcanic explosions pumped vast amounts of greenhouse gas into the air, which drove global warming and ultimately harmed much of the Earth's biosphere, although dinosaurs during that time spread out widely and became the dominant terrestrial vertebrates for reasons that still aren't clear. The paper says modern coral reefs and other recognizable ecosystems also formed in the aftermath.

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Stephen Brusatte, a paleontologist at the University of Edinburgh who wasn't involved with the research, was impressed with the study and said the researchers "have set out an ambitious agenda for testing this big, bold idea that dinosaur diversification was triggered by climate and environmental change," but he also acknowledged more needs to be done to see if the two events are really linked. Still, he said, "I think the odds are good." Read more at The Guardian.