Conservationists want the cactus ferruginous pygmy owl back on the endangered species list, but opponents say it’s unnecessary.

All eyes have been on the Bighorn Fire since it sparked on June 5.

But now, city and county leaders are preparing for what comes next — monsoon and flooding.

Looking for a new activity to do while staying home to social distance? 

A number of scientists host weekly games and challenges on Twitter. Players get to have fun for free while learning trivia about the natural world.

For ages, the shadow of a volcano has hung over the fall of the Roman Republic. Ancient historians told of the Sun’s mysterious disappearance after Julius Caesar’s murder in 44 B.C.E., which was followed by bouts of cold and crop failures. Now, a team of scientists and historians has discovered that one of the largest known eruptions in history struck in 43 B.C.E.—potentially contributing to 2 years of weird weather and famine as the republic dissolved and the empire took shape.

University of Arizona history professor, UNESCO chair in Environmental History and former director of the UA's Global Studies Program David Pietz is in a class of his own, winning three prestigious titles rewarding him for his seminal research in Chinese water conservation. 

From the Bighorn Fire continuing to burn through the beloved Catalina Mountains to the human-caused Bush Fire near Phoenix, now deemed as the largest current fire in the U.S., fires are taking a toll on the wilderness of Southern and Central Arizona.

 number of factors that contributed to how big the Bighorn Fire has been and where it's burned on the mountains.

The saguaro cactus, an iconic symbol of the Southwest and a key cultural touchpoint to desert tribal peoples such as the Tohono O’odham, may one day begin to fade from some parts of the Sonoran Desert as natural and human-caused factors reshape the landscape.

Conservation groups sued the Trump administration last week saying the U.S. Forest Service and U.S. Fish and Wildlife Service have failed to adequately protect the imperiled Mount Graham red squirrel. 

The strike against Tucson-based copper producer Asarco by unions representing about 1,800 workers in Arizona and Texas is in its eighth month, with no talks underway or planned.

Researchers at the University of Arizona said some fire is necessary to create habitats.