(CNN)Sixty-five million years ago, the dinosaurs disappeared in what's known as the Earth's fifth mass extinction. Today, a sixth mass extinction could be well underway and humans are the likely culprit, according to new research published in Science Advances.
The past five mass extinctions on Earth were caused by large-scale natural disasters like meteors or enormous chains of volcanic eruptions, wiping out between half and 96% of all living species.
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