Pima County is proposing new regulations to manage truck traffic on unpaved roads near the proposed Copper World mine.

The planet’s premier climate conference is happening right now in Brazil, as world leaders negotiate ways to reduce warming emissions and reckon with the exploding data center industry. Phoenix Mayor ...

Residents of Haystack Ranches have filed an appeal to the Arizona State Land Department, asking the state to overturn an ...

While Trump scraps US climate policies, companies still face pressure from states, other countries and their customers. That ...

A new analysis tries to calculate the coming environmental footprint of AI in the US and finds that the ideal sites for data ...

After biking through the higher-elevation forests, Republic reporter Joan Meiners finds a different Arizona Trail below the ...

As the everyday use of AI has exploded in recent years, so have the energy demands of the computing infrastructure that ...

Experts say the Colorado River shows no sign of recovery. The Republic asked water providers how they would survive shortages.

Detroit — Making electric vehicles and their batteries is a dirty process that uses a lot of energy. But a new study says that EVs quickly make up for that with less overall emissions through two ...

Tucson, incorporated in 1877, is considered Arizona's oldest city. The Old Oraibi Village, settled by the Hopi Nation around A.D. 1100, is one of the oldest continuously inhabited communities in the ...

Salt River Project hopes to convert a coal-fired unit to natural gas at Springerville Generating Station, one of Arizona's last remaining coal plants.