The historic drought has thrown the Colorado River and its water system into crisis, with federal officials warning that serious conservation is the only way out.
Glaciers, one of the world's priceless natural resources, are melting rapidly because of global warming.
Mountains grow, shrink and change shape both slowly and suddenly, and human behavior is changing them in alarming ways.
Western wildfires have blanketed normally pristine landscapes with smoke. What's a photographer to do?
As the pandemic wanes in the United States, the crowds have returned to Yellowstone National Park.
The racial history of the United States belongs to us all, with the responsibility to resolve the accompanying outstanding problems.
The colorful annual mountain men rendezvous at Fort Bridger, Wyoming, commemorates the 19th century global fur trade.
The mammoth Colorado River is the lifeblood of the southwest United States, supplying water and power for cities and agriculture.