In 2014, São Paulo nearly ran out of water. Schools closed, crops faltered and reservoirs were left at a tiny 5 percent of their capacity for the city and its surrounding population of 22 million. It was the worst drought in eight decades. ...

Most people don’t associate cities with trees, but urban areas are actually dependent on healthy forests. Trees within cities reduce heat, provide spaces for recreation and socialization, and increase property values. Nearby trees in the watersheds around cities filter drinking water and ...