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

Plans to Use Helicopters in Wilderness Areas Worries Conservationists

Arizona Game and Fish wants the aircraft to manage bighorn sheep.

TEP’s Parent Company Purchases Gas-Fired Plant

It will contribute to utility's goal of reducing coal-fired electricity generation by 32% in next four years.

What's Next for Colossal Cave Park?

Pima County wants new ideas for 2,000-acre park

Seasonal Closures Begin in the Santa Catalina Mountains

Safety concerns, effort required to keep roadways clear of snow, ice.

Will This Be the Hottest Year Ever in Tucson?

Meteorologists expect 2014 to be the warmest on record.

EPA OKs Test Site Permit for Proposed Copper Mine in Florence

Opponents wonder if project can be operated safely.

Parts of Pima County Under Citrus Quarantine

Presence of an insect that can carry disease found in region.

Arizona Hopes to Protect Breeding Bald Eagles

Game & Fish closes two dozen areas near rivers, creeks, lakes around state.

Pollutants Stay in the Air Longer During Winter

Pima County environmental officials explain the yellow-brownish haze seen in the morning sky this time of year.

Legendary Grand Canyon Conservationist, Boatman Dies at 97

Martin Litton passed away Sunday in his California home; devoted his live to preserving wilderness.

4.7 Earthquake Hit Sedona Sunday Night

Temblor centered 7 miles north of the northern Arizona town and 6 miles underground; no injuries reported.

Mike Kazz, president for Grecycle, demonstrates how to turn turkey grease into fuel.

Tucson Has Recycling Options for Leftover Turkey Grease, Oil

Pouring it down the drain can cause major problems.

Female Gray Wolf Wanders in Grand Canyon

Animal was first seen on North Rim earlier this month; wildlife officials confirm species.

Arizona's Largest Utility Would Oppose Energy Efficiency Changes

Corporation Commission recently drafted amendments to rules it set in 2010.

Bighorn sheep in Santa Catalina Mountains.

More Bighorn Sheep Released North of Tucson

14 sheep scamper uphill to join a dozen surviving from last year's release; more coming Friday.

Grijalva Gets Leadership Post in US House

The Tucson Democrat is now the ranking member in the Natural Resources Committee.

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