as the Washington Post put it on the verge of mass extinction mass, accelerating extinction than ever before sixth mass extinction scientists predicting the sixth mass extinction more…. more…. mass extinction sixth mass extinction most scientists now believe more…. Earth is on Brink of a Sixth Mass Extinction “Sixth Mass Extinction” scientists predicting the sixth mass extinction “Sixth Mass Extinction” mass extinction told the Washington Post sixth mass extinction a sixth mass extinction more…. Mass species extinction