SUMMARY: Most scientists agree that a large meteor probably wiped out the dinosaurs 65 million years ago, but two geologists from the University of Leicester think that some homegrown cataclysms might have done the trick for previous extinctions. There just isn't enough evidence that an impact caused the mass extinction that happened 250 million years ago. But one of the largest flood basalt eruptions did occur at that time, and released enough greenhouse gasses to dramatically change the Earth's climate - killing the dinosaurs off in the process.
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