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There is one idea which would spend billions of additional dollars for personnel, equipment and barriers along the border with Mexico, but this is raising red flags for environmentalists.

Sierra Club: Border Wall Would Harm Endangered Species

Environmental group says Donald Trump's proposal has risks for wildlife.

Pima County Issues Air Quality Watch, First of Season

Those with heart or lung conditions cautioned to avoid exposure to outdoors.

Springtime Buzz: How to Stay Safe around Swarming Bees

One way to deal with increased pollen-gathering activity: 'Run ... keep running.'

University of Arizona geosciences professor Jon Pelletier walks through the forest on Cerro del Medio, a mountain in New Mexico’s Valles Grande, after the 2011 Las Conchas fire.

Study: Wildfires Responsible for 99% of Erosion in West

UA researchers assess impacts for a million years

Members of the Compost Cats show their EPA award at the San Xavier Cooperative Farm.

'Compost Cats' Earn National Honor for Reducing Food Waste

Across the nation almost 35 million tons of food go into landfills each year.

Environmental Official: Mother Nature Doesn’t Know Borders

Border 2020 members meet to discuss water, air and emergency preparedness.

Tips for Ensuring Recyclables End Up Being Recycled

20 percent of materials placed into household recycling bins are contaminated

NASA: Arctic Ice Photographed at Its Smallest on Record

Ice the size of 'two Texases' has disappeared in less than four decades, scientist says.

The sun sets in the Arizona desert wilderness.

Wildlife Agency Mulls Status Changes for 8 Arizona Species

Western Bumble Bee, Southwestern Willow Flycatcher to be investigated further

'Promotoras' Enlisted to Grow Rainwater Harvest

Latina community health educators hope to bring about greater awareness.

Water levels at the Colorado River basin.

Forecasters Predict Arizona Will Return to Drought Conditions

El Niño’s rains went north to Sierras and Pacific Northwest

Praise and Pushback for Oak Flat Historic Designation

Native American sacred site sits atop proposed Resolution Copper Mine.

Forest Service Says No to Grand Canyon Development

Proposal was for development of shops, restaurants and 2,000 homes

A time lapse photograph of light pollution from Tucson reaching the Picacho Peak night sky.

Bill Would Loosen Restrictions on Electronic Billboards

Astronomers worried that it will lead to incremental loss of dark skies.

University of Arizona geneticist Taylor Edwards and the recently discovered Goode's Thornscrub Tortoise.

New Desert Tortoise Species Identified by UA Geneticist

Understanding animal’s habitat and habits will aid its preservation.

Bighorn sheep in Santa Catalina Mountains.

Bighorn Sheep Population Grows in Santa Catalinas

The program to reintroduce bighorn sheep into the Catalina Mountains is about two and a half years old.

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