New research suggests Earth's Sixth Mass Extinction event, on par with the one that ended the age of dinosaurs, already is under way. Noah Greenwald, endangered species director at the Center for Biological Diversity, said the recent findings add to a growing pile of troubling news, including projections more than a million species are likely to be lost in coming decades due to human activity. Greenwald emphasized it is a problem because species make up ecosystems, and ecosystems provide critical services for people. ...