The Republic's climate reporter started her journey on the Arizona Trail with detours that were forced by wildfires and left ...

A study led by University of Arizona researchers shows that decades of groundwater pumping by humans has depleted Tucson-area ...

A set of fossilized footprints discovered in northern Arizona has revealed the silent journey of a prehistoric arachnid that walked the Earth around 260 million years ago. Preserved in stone, these ...

In the quiet layers of rock, footprints, bones, and leaves tell a story of worlds lost, and of our own uncertain future. The ...

WASHINGTON (AP) — A week after her decisive win in an Arizona special election, Adelita Grijalva arrived at the U.S. Capitol, where her father had served for decades. Judge dismisses young climate ...

Grab an umbrella — tropical moisture from Hurricane Priscilla pushes into Arizona, bringing several days of showers and ...

Fluence Energy ( NASDAQ: FLNC) is at the intersection of the largest secular trend in decades, the meet-up between the ...

California's leading Democrats are grappling with how to confront lost jobs and high gas prices that the oil industry says are the result of the state's climate policies.

The dinosaur’s bones are being held at the National University of Patagonia San Juan Bosco. There are no plans to put the dinosaur’s remains on display, but Ibiricu said he’ll speak to officials about ...

A planned shutdown of Valero's massive refinery near San Francisco in the spring would really put the pinch on motorists.