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Science in the Critical Zone

University of Arizona scientists working at the Critical Zone Observatory in the Catalina Mountains are studying Earth’s thin surface
A view from the Atascosa Borderlands in the Coronado National Forest.

Atascosa Borderlands: Connecting the land, the wildlife, and the people.

Also on Arizona Spotlight: Dr. Jasleen Chhatwal on helping loved ones survive dark times; and, how do YOU pronounce "Sahuarita"?
Worker operates wood chipper in Phoenix.

Tucson TreeCycle recycling program in effect for New Year holidays

Residents can bring their Christmas trees to city sites through January 15.
Stacks of hay bales sit beside an irrigation canal in Imperial Valley on June 20, 2023. Critics have called for reductions to the amount of alfalfa grown with Colorado River water. The particularly thirsty crop is mostly used for cattle feed.

The Buzz: A legislative look-ahead at water and agriculture

The new legislative session is weeks away, so we look at the state's top water user.
The entrance of the South32 Hermosa mine site, a critical minerals project that looks to source manganese and zinc.

New project developments underway for South32 Hermosa project

Mining company addresses community health, workforce development and transparency in Hermosa critical minerals project
Traffic in downtown Tucson.

Local leaders advocate swift action on EPA’s greenhouse gas standards for vehicles

Driving change: Calls for accelerated emission standards gain momentum as communities look to embrace cleaner, safer transportation solutions
A participant waits at an information session on composting and Tucson's new FoodCycle at Home program in Tucson, Ariz., on Saturday, Dec. 9, 2023.

Tucson to launch at-home composting program next year

Composting keeps harmful greenhouse gases out of landfills.
The sun rises over a field in Northern Arizona.

UA’s College of Public Health secures $3.8 million NIH grant to pioneer climate change and health research

SCORCH initiative focuses on forecasting, adaptive responses and community resilience
An electric transmission line.

Construction resumes on SunZia Transmission Project following temporary suspension

Bureau of Land Management’s pause addresses cultural property concerns in the San Pedro Valley, work progresses on 520-mile transmission project
The San Pedro River post-Monsoon rain. September 14, 2023.

Fort Huachuca and U.S. Fish and Wildlife Service must re-assess water savings analysis

The Ninth Circuit Court of Appeals ruled that the government and Army did not provide sufficient evidence of water savings through conservation efforts.
An endangered Red Squirrel partakes of a snack from a feeder placed on Mount Graham by the U.S. Forest Service and U.S. Fish and Wildlife. Image taken by a remote camera.

Endangered red squirrel's numbers show decrease this year in southeastern Arizona

The annual survey conducted jointly by the Arizona Game and Fish Department, Coronado National Forest and the U.S. Fish and Wildlife Service showed an estimate of 144 squirrels.
Arizona Attorney General Kris Mayes asked Cochise County residents to share their thoughts on the Kroger and Albertsons merger agreement at the Ethel Berger Center. July 26, 2023.

Arizona Attorney General initiates investigation into hazardous lead-covered cables, telecommunications infrastructure

Mayes takes action to safeguard environment, drinking water and public health
The San Pedro River post-Monsoon rain. September 14, 2023.

U.S. Department of Justice initiates water rights decree for San Pedro Riparian National Conservation Area

Environmental group says decree prompts evaluation of existing water rights certificates
A diamondback rattlesnake flicks its tongue.

Arizona rattlesnakes could be affected by I-11 construction

A portion of the project cuts through desert land, which experts say could cause continuing concerns for wildlife.
We visit Altar Valley west of Tucson where various members from the community and different agencies have created the "Altar Valley Conservation Alliance" to try to protect the land for future generations while allowing ranchers and others to continue to make a living on it.

Federal initiative awards Altar Valley Watershed $1.2 million for flood resilience

The investment drives innovation for water infrastructure projects
A file image of the Sonoran Desert.

Pima County to Reorganize Environmental Departments next year

The new Conservation Lands and Resources Department is expected to be completed next summer.

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