Add Yahoo as a preferred source to see more of our stories on Google. A wastewater heat recovery system operates Tuesday, Dec. 2, 2025, at the National Western Center in Denver. (AP Photo/Brittany ...

Add Yahoo as a preferred source to see more of our stories on Google. Wastewater flushed down the drain can be used to heat and cool homes and buildings in a sustainable way and climate experts say it ...

Every summer, heatwaves keep smashing records. The World Meteorological Organization reported that the past seven years were the hottest ever recorded. As cities keep warming, buildings and people ...

DENVER(AP) — 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 ...