The Permian, Triassic, and cretaceous extinction events were caused by asteroid impacts, volcanic eruptions, and greenhouse gases.
Until recently, scientists have disagreed on what caused Earth's greenhouse gases waters to become so uninhabitable to life that 96% of marine species disappeared at the end of the Permian epoch. According to recent studies, global warming rendered ocean species unable to breathe, which led to the "Great Dying." Permian Major modifications to the greenhouse gases on Earth, extinctions such as those caused by enormous volcanoes that erupted in igneous Permian provinces and covered hundreds of thousands of square miles in lava, appear to be the main cause of mass extinctions.
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