A Paleontologist's Perspective on Mass Extinctions Past and Present - Professor Pincelli Hull

The question of whether we are in the middle of the sixth mass extinction is debated by geologists. Perhaps an extremely simplistic way of trying to understand this very complex debate is that you really don't know if you are in a valley until you get out of it! But there's no denying that species continue to become extinct whilst we are in this valley.

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