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Santa Cruz River bed

Study: Southwest May Face Multi-Decade Drought

If the rate of greenhouse emissions stays the same, it will likely hit by the end of the century.

A field of stars lights up the night sky above the Grand Canyon in northern Arizona.

NAU Project Will Study National Park Boundaries from Space

The team will look at divisions caused by land-management choices, like logging.

Jason Katterhenry tells us about the UA mobile phone app for tracking dust storms.

Sensors, Signs: System to Warn I-10 Drivers of Dust Storms

Electronic monitoring will take place along a 10-mile stretch between Eloy and Casa Grande.

A saguaro cactus in the Grand Canyon National Park is in full bloom, displaying beautiful pink flowers.

Spring Is Coming Earlier and Earlier, UA Study Shows

The problematic pattern result of climate change, says co-author of the study.

Glen Canyon Dam.

Does the Colorado River Dam Management Plan Hold Water?

Two-decade plan has support from states, but not from some environmentalists.

A rendering of Earth from space.

Radar Links Wastewater Pumping to Earthquakes

Technology observing dips and buckles of Earth found uplift near injection wells.

A view of Nogales, Ariz. and Nogales, Mexico.

App to Tell Nogales Residents When Air is Unsafe to Breathe

Cooler weather, mountainous basin and pollution team up for a dangerous combo.

The Tucson night skyline is darker than other cities of average size.

Pima County Ground-Level Ozone Safe, But Just Barely

More than a year ago the EPA decreased the level it considers safe for public health.

Arizona Land and Water Trust Wins National Award

Recognized for its work on water issues and land preservation.

Sunlight reflects off of the water in a swimming pool.

Treated Water to Make Beer? Tucson Group Says 'Cheers!'

Pima County team fights stigma against reclaimed water; finalist for innovation distinction.

Visitors Flock to Arizona State Parks in Record Numbers

Nearly 3M tourists spent more than $16M at the parks, which lost some funding in 2012.

US Mexico Border

Arizona Receives $1 Million for Continuing Border Cleanup

Extension of funds used to clear 29 tons of waste from the Nogales Wash.

Oak Flat, in the Tonto National Forest east of Superior. Resolution Copper Mining has proposed building a large underground copper mine at the site.

San Carlos Apaches, Others Sue Over Copper Mine Waste Site

Lawsuits claim US Forest Service violated several environmental laws.

Arizona Tribes in Solidarity over Stopping North Dakota Pipeline

For many tribal members in the state, the conflict hits close to home.

Just a small portion of the Saguaro National Forest conservation area.

Study: Saguaro Survival Sign of Climate Change Effect

Scientist connects age of saguaros with volcanic activity that changed temperatures.

Sirena Dufault began exploring the Arizona Trail in segments before completing it twice.

The Arizona Trail Opens New Paths for Tucson Resident

Accident leads to exercise and new discoveries

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