Earth faces “biological annihilation” in sixth mass extinction, scientists warn

(CBS NEWS) – Over the last half-billion years, scientists say there have been five mass extinction events on Earth in which a wide diversity of species on this planet suddenly died off. Now, there’s growing evidence that a sixth mass extinction is unfolding, according to scientists who track species around the globe. In a new study, researchers say the current mass extinction is even “more severe than perceived” and amounts to “biological annihilation&rdqu