Five major #extinction events have struck #Earth in the past 500 million years, and now we appear to be in the midst of a sixth one. A new paper in the journal Science Advances, using the most conservative estimates of the number of #species that have recently gone #extinct, finds that we're facing "a dramatic decay of #biodiversity." For a clearer understanding of what a mass extinction event is, check our our #infographic on the first big five (link in profile). #animals #climatechange #biology #climate #arctic #tropics #6thextinction #families #life 📷 @julierossm