U.N.: 2015 is the Hottest Year on Record

Because of man-made global warming and a strong El Nino, Earth’s wild weather this year is smashing the annual heat record, the World Meteorological Organization announced on Wednesday.

Earth’s Riverine Bloodstream

In a sense, rivers are like airport terminals connecting air, mountains, rocks, plants, soil, and the ocean. And like travelers in airports, the materials transported by rivers can tell stories of where they’ve been, what’s happened to them, and where they’re going.