It only took three days of swiping before he popped up. I froze, thumb hovering over the X. I scrolled through his photos and prompts, looking at what he had changed since I’d seen it the first time.

Glaciers offer unparalleled insight into the world’s climate. But as they melt, the data they offer is less useful—and more dangerous to collect.

For most of the world’s industries, sustainability is an exercise in correcting the mistakes of the past — from changing mindsets to the very machinery used.

For Gavin Emmons and Alacia Welch to do their jobs, they have to be expert climbers, have extensive search-and-rescue training, be experts on endangered bird species and know how to do phlebotomies in the middle of the desert.

Dean Swift has gotten really good at spotting where squirrels hide their seeds.

The solution to the world’s climate change problems could be under our feet, as soil has the potential to store more than three times the amount of carbon in the atmosphere.

Activists working in California’s public wilderness to remove illicit cannabis grows — hundreds of which use carbofuran, a pesticide banned in the United States for its high toxicity — have seen the number of sites increase for the first time in 15 years.

Randy Nuñez and Sasha Nuñez-Carvalho were married in October while he was quarantined with the coronavirus in San Diego and she was deployed by the Navy, 4,000 miles away, in Europe.