Tony Davis

The Arizona Department of Environmental Quality air quality permit was issued for Copper World, an open-pit mine complex that would operate about 30 miles southeast of Tucson on the Santa

The Trump administration’s move to halt spending on “green” energy programs leaves a big question mark hanging over federally funded water conservation efforts from Tucson to Southern California’s Imperial Valley

Many water officials have seen cloud seeding as one possible fix for the U.S. West's extended drought, but a new federal report finds it's still not clear how effective the

The plant, slated for the metro area’s northwest side, would provide only a small portion of the city’s total drinking water supply but it could lead to more and bigger

Hudbay Minerals Inc. still needs to complete a final feasibility study and find a financial partner before work begins on the $1.3 billion project in the Santa Rita Mountains.

December was the third of the last four months with record-setting annual temperatures. Overall, 2024 finished as Tucson's third warmest year on record.

For Star subscribers: Warming temperatures, not declining precipitation, have by far been the biggest triggers of the drought that has overpowered the Western climate since 2000, a new study finds.

Trump's call for up to 100% tariffs on Mexico would hike US prices, experts say

Electricity rate increases for two big utilities including Tucson Electric Power accelerated in recent years, intensifying debate among Arizona Corporation Commission candidates over whether the commission is too cozy with

The Arizona Department of Water Resources said Wednesday it’s taking the first steps to usher in groundwater pumping regulation in the Willcox Basin, whose aquifer has dramatically declined due to