Blue and Green: The world is currently in a period of mass extinction, according to a new study. Human activities have been linked to the falling populations of many species but the research also warns that extinction on a large scale could threaten human existence.
The study, which has been published in Science Advances, calls for fast actions to protect threatened species, populations and habitat. It estimates that species are disappearing up to about 100 fasters than the normal rate between mass extinctions,...