As climate change melts permafrost, landslides are becoming more dangerous

In northern latitudes and high altitudes, permafrost stays frozen year-round, holding mountain summits together. As global temperatures rise, much of it thaws, loosening soil and increasing landslide risk. National Geographic Explorer Paul Salopek is in Alaska, observing a man developing an early warning system for landslides to help communities prepare. Scrambling up the side of a mountain, tracing the path of a receding glacier, is not a part of most people’s average day at the office. But for National Geographic Explorer Paul Salopek, walking across much of the world, it is all in a day’s work. Sa... [331 chars]