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St. Gregory College Preparatory School is installing one of the largest solar energy systems in a Tucson school, producing 140 kilowatts of electricity.

Corporation Commission Proposes Changes to Energy Efficiency Rules

Commissioner says it is a way to keep standards realistic; outside group argues it is a gutting of a highly progressive law.

Shawnee Riplog-Peterson, curator of mammology and ornithology at the Arizona-Sonora Desert Museum, discusses the multi-state, binational breeding program involving bighorn sheep.

17th Bighorn Sheep Found Dead

Arizona Game & Fish says cause is unknown; 31 animals were reintroduced to Catalina Mountains a year ago.

Saguaro National Park

'Bike Ranch' Proposal Near Saguaro National Park Causes Concerns

Opponents worry construction project is too dense; proponents say it's an environmentally-friendly way of developing land.

Grand Canyon

Feds Propose More Flights Over Grand Canyon

Pilots already fly up to 57,000 trips a year, more than any other national park.

These olive trees at the U of A provide shade and beauty to the campus and its visitors.

University of Arizona Hosts 2nd Annual Olive Harvest

Members of the community invited to participate; campus home to hundreds of trees.

Glenn Canyon Dam

Glen Canyon Dam Will Release More Water as Part of Experiment

Bureau of Reclamation looking into higher flows, effects it has on sandbars along Colorado River downstream.

Pima Animal Care Center is Expanding

58% of county voters approved a $22M bond on Election Day.

Wandering Gray Wolf Arrives at Grand Canyon

Scientists say this is a historic moment in Northern Arizona; species faces uncertain futures.

Shawnee Riplog-Peterson, curator of mammology and ornithology at the Arizona-Sonora Desert Museum, discusses the multi-state, binational breeding program involving bighorn sheep.

More Bighorn Sheep Coming to Catalina Mountains

Second stage of controversial program to reintroduce animal to Tucson area.

Bureau of Reclamation Looking to Sell Stockpile of Water Credits

As much as 20 billion gallons of recharged groundwater in Tucson up for sale.

Trick or Treaters May Not Be Only Ones Hunting for Food on Halloween

Jack-o-lanterns outside people's homes could attract some desert animals.

Grand Canyon

Multiple Acts of Vandalism Reported at National Parks in West Coast

Photos of crudely painted graffiti-style images appear on Instagram account; investigation into Gran Canyon occurrence.

UA Graduate Student Gets EPA Award

Chris Guiterman will spend next two years researching effects past changes in climate have had on pine forest in Arizona.

Mt. Lemmon near Tucson, Arizona.

Fall Colors Glow on Mount Lemmon

US Forest Service says autumn tones are at their peak at least for another week.

Public Gets More Time to Comment on Increased Training Flights in Tucson

Davis-Monthan released its environmental assessment in September saying region would feel little to no effect.

Wastewater

Study Looks into Effects of Wastewater on Santa Cruz River

Sonoran Institute, local officials release initial report on water quality after recent upgrades to treatment facilities.

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