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Long-Time Colossal Cave Director Uncertain About Her Future at Park

Pima County Supervisor Carroll called for performance audit last summer to assess management of park amid mountain lion shooting.

Water levels at the Colorado River Basin.

More Water Headed to Lake Mead

Surrounding towns depend on source for water supply amid more than a decade-long drought.

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

Solar a Central Issue in Corporation Commission Republican Primary

2 commission seats up for grabs; four GOP candidates seek their party's nomination, face off two Democrats.

National Parks Grand Canyon

Road to Grand Canyon West Now Paved

Project cost more than $30M; will ease access to canyon's Skywalk.

AZ Top in Nation for Solar Energy Per Capita

Study notes state policies such as Renewable Energy Standard have attracted more people to get clean energy; also pointed some setbacks in past year.

Water levels at the Colorado River Basin.

$11M Project Aims to Preserve Colorado River Water

Dept. of Interior, Arizona, three other states collaborating to reduce demands by cities, farmers, industry.

AZ Mexican Gray Wolf Pups Thriving in NM, Wildlife Officials Say

In May, pair was transferred to area with another pack in neighbor state; project aims to improve genetic health of the endangered animals.

Major AZ Utility Plans to Install Thousands of Solar Panels for Free

Aims to provide these to customers who can't afford to buy or lease; satisfy state mandates for renewable energy.

EPA Finalizes Emissions Rules for Navajo Generating Station

One of three generators to be shut off by 2020 at coal-fired plant to meet standards, clear air over Grand Canyon.

Expansion of Wolf Habitat in AZ, NM Up for Public Comment

Federal wildlife officials propose letting Mexican gray wolf roam across two states south of I-40 to enhance growth.

Mountain lion in the mountains west of Tucson.

Project Hopes to Photograph Jaguars, Ocelots Near Tucson

Camera traps set up at more than 200 places in mountains surrounding the city.

Bighorn sheep in Santa Catalina Mountains.

Bighorn Ram Rejoins Catalinas Herd

Arizona Game and Fish says his return bodes well for pack; good mating season, successful lambing season would bolster group.

Teenagers Ask Big Questions at Biosphere 2's Summer Academy

It's a Tuesday afternoon, a group of high school kids are trudging in rubber boots through only mangrove forest in Southern AZ.

Familiar Sounds of Summer

Some "singing cicadas" are associated with the monsoon but a bug expert disagrees.

Part of Grand Canyon Bison Herd Recently Moved

19 animals taken back to their original home on Arizona Strip; more than 300 remain.

Controlled Burns in Catalinas Part of Forest Thinning Operation

About 20 acres of wood will burn on Mount Bigelow, Spencer Canyon in next few days; will be visible from Tucson, Coronado Natl. Forest says.

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