Grist: Humans got a new nickname this week: The Agents of Disturbance. And boy, do we deserve it. In a new study published in the journal Nature, researchers report that humans have been agents of disturbance on this planet roughly since the dawn of civilization. Starting around 6,000 years ago, we began to fundamentally change the way that plants and other animals coexist something that even mass extinctions and severe climate change havent been able to do on their own. Its not clear exactly how...