The deadliest environmental threat to city dwellers worldwide isn’t earthquakes, tornadoes, flooding, or fire. It’s heat. By June this year, more than 1.5 billion people had spent a day in life-threatening temperatures above 103 degrees Fahrenheit, according to an analysis by The Washington Post. In Phoenix, Arizona, where almost 400 …

Before Michelle Fournet moved to Alaska on a whim in her early twenties, she’d never seen a whale. She took a job on a whale watching boat and, each day she was out on the water, gazed at the grand shapes moving under the surface. For her entire life, she …