Guardian: Humans are eating away at our own life support systems at a rate unseen in the past 10,000 years by degrading land and freshwater systems, emitting greenhouse gases, and releasing vast amounts of agricultural chemicals into the environment, new research has found. Two major new studies by an international team of researchers have pinpointed the key factors that ensure a livable planet for humans, with stark results. Of nine worldwide processes that underpin life on Earth, four have exceeded safe...