In growing areas of the planet, sundown no longer brings night and stars, but rather an artificial dusk caused by human light sources. To track light pollution’s global spread, researchers looked beyond space technology and asked citizen scientists to provide some ground truth.

Winter storms in the past week dropped more than 5 feet of snow in parts of Flagstaff. And additional snowfall is expected with the latest weather system moving in Thursday night.

Mexico’s environmental ministry has approved a transmission line project from a major solar plant in Sonora to Baja California. It is part of the country’s most ambitious clean-energy plan.

The U.S. Department of Energy has announced a $42 million plan to make advanced electric vehicle batteries cheaper and more efficient in America. And a Tucson company will take part.

The Environmental Protection Agency, or EPA, will award $100 million worth of grant money to help communities impacted by climate change and other environmental inequities.

The Sonoran capital Hermosillo has a new protected area, after the status was made official for wetlands on the western extreme of the city.

Mexican officials say they have made progress in protecting the critically endangered vaquita marina porpoise by arresting poachers in the uppermost part of the Gulf of California.

Contractors hired by the state of Arizona have started dismantling a makeshift border wall made of out shipping containers in Yuma and Cochise counties. Protesters who stopped work in Cochise County say they want to partner with the U.S. Forest Service to ensure the construction doesn't cause more harm.

The fiscal omnibus bill approved just before the new year includes nearly $1 billion for protecting the nation’s watersheds. And of that, northern Arizona’s Coconino County will receive $50 million.