Earth's sixth mass extinction event under way, scientists warn

Researchers talk of ‘biological annihilation’ as study reveals billions of populations of animals have been lost in recent decadesA “biological annihilation” of wildlife in recent decades means a sixth mass extinction in Earth’s history is under way and is more severe than previously feared, according to research.Scientists analysed both common and rare species and found billions of regional or local populations have been lost. They blame human overpopulation and ov