Hourly Weather - Handan, China

At a Glance Researchers say 734,000 square miles of land that had remained relatively undisturbed was impacted by humans.Wilderness areas are critical to stop extinction and halt climate change, the scientists say.Only one-fourth of the Earth's surface remains wilderness. An area of intact wilderness the size of Mexico has been significantly changed — and much of it was lost forever — in just 13 years, a new study found. From 2000 to 2013, humans modified 734,000 square miles of land...