Scientists have documented five major mass extinction events in Earth's history, during which at least three-quarters of life went extinct. But with humans clearing habitats, exterminating species and changing the climate, are we now in a sixth mass extinction?
Many researchers claim the sixth mass extinction is underway, with one team describing "biological annihilation" and "mutilation of the tree of life" in their scientific studies. However, others argue that the mass extinction hasn't begun yet.
