A long-term trend of ecological improvement is appearing in the mountains west of Boulder.

A new national study of public water systems found that arsenic levels were not uniform across the U.S., even after implementation of the latest national regulatory standard. 

On the island of Spitsbergen, glaciers grind up sandstone, leaving an abundance of sediment that stains the meltwater.

Arctic Report Card: 15 years of observations document impact of changing polar climate

An international team of scientists has used artificial intelligence and commercial satellites to identify an unexpectedly large number of trees spread across arid and semi-arid areas.

The state’s brutal fire season has not ended.

Assistant Professor of Geography Julie Loisel is among a team of scientists who agree that preserving peatlands is essential to limiting climate warming.

In the past 20 years, Central Europe has experienced six summer heat waves and droughts.

An area in the Olympic Peninsula’s Hoh Rain Forest in Washington state for years held the distinction as one of the quietest places in the world.

In 2018, California wildfires caused economic losses of nearly $150 billion, or about 0.7 percent of the gross domestic product of the entire United States that year, and a considerable fraction of those costs affected people far from the fires and even outside of the Golden State.