In 1978, Greta Hibbard was twenty-two and living in rural Oregon. She had a two-year-old daughter, a minimum-wage job, and an unemployed husband. She was, she would later say, “living on peanut butter ...

Glaciers function as critical infrastructure, supplying water, food, and energy for nearly half the world’s population, even though they cover only a small share of the Earth’s surface. That support ...