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Environment

A wastewater heat recovery system operates Tuesday, Dec. 2, 2025, at the National Western Center in Denver. (AP Photo/Brittany Peterson)

How sewage can be used to heat and cool buildings

- Associated Press

When a massive event center was being developed in Denver, planners had to contend with two existing 6-foot (1.8 meters) wide sewer pipes that emptied into the river, creating an unsightly dilemma. Developers wanted to bury them. The utility said the wastewater needed to vent heat before entering the river.

A gondola hangs in front of snow-scarce mountains Thursday, Dec. 18, 2025, in Avon, Colo. (AP Photo/Brittany Peterson)

Warm weather and low snowpack bedevil Western ski resorts

- Associated Press

Ski resorts are struggling to open runs, walk-through ice palaces can't be built, and the owner of a horse stable hopes that her customers will be satisfied with riding wagons instead of sleighs under majestic Rocky Mountain peaks. It's just been too warm in the West with not enough snow.