The words ‘Mississippi River’ evoke images of a mustachioed Mark Twain — or the whistle of a steamboat calliope. “But that river doesn’t exist anymore,” said historian Christopher Morris.

City lights drive back the night a little more each year, disrupting ecological cycles. Now, energy-efficient lights could be making light pollution worse.

Officials for the Tonto National Forest have announced new restrictions for recreational targets shooters in an effort to reduce the amount of trash left on forest floor.

Despite a few sprinkles here and there around the Valley on Friday morning, the official rain gauge at Sky Harbor Airport hasn’t seen precipitation since late August.

This week marks 25 years since more than 1,700 scientists, led by the Union of Concerned Scientists, issued a “warning to humanity” concerning the costs of continued environmental destruction. Now, they’ve issued another – this one signed by 15,000 scientists representing 184 countries.

Bisbee plans to fight back after Arizona lawmakers forced the small town to repeal its mandatory ban on plastic grocery bags.

The communities of New River and Desert Hills moved one step closer to getting a fix to their water woes. The Arizona Corporation Commission approved rates for a plan put forward by the utility EPCOR.

The U.S. solar industry is on edge - waiting to see whether the Trump administration will impose steep tariffs on foreign made solar panels. Unease over the looming decision is already affecting the market. Federal regulators are set to make their recommendations to the President next week

The companies say the community would be the first of its kind in the U.S. and comes as utilities have been studying the potential benefits of integrating battery storage along distribution grids and decreasing reliance on centralized fossil fuel plants.