climate change

U.S. officials have approved a long-lasting fire retardant that could significantly aid in fighting increasingly destructive wildfires. The U.S. Forest Service on Tuesday approved Perimeter Solutions' fire retardant that is intended to be used as a preventative measure and can last for months. It's similar to the red-dyed retardant dropped from aircraft, but it is clear and lasts much longer. The company says its primary use will be by industrial customers such as utility companies and railroads, but can also be used at residential and commercial properties.


U.S. hydropower generation is forecast to drop 14% this year compared with 2020 as drought grips vast areas of the West. Experts say the reductions complicate grid operations since hydropower is a relatively flexible renewable energy source that can be easily turned up or down, such as in the evenings when the sun goes down and solar energy generation drops. The projected declines in hydropower are concentrated in the West, with California's production expected to fall by nearly half. Declines in hydropower production mean bumps for other energy sources, such as natural gas.

AP Photo/Matt York

Soaring temperatures fueled by climate change are making it harder to live in some of the nation's fastest-growing cities, such as Phoenix and Las Vegas. 


Indigenous nations are at the frontlines of climate change, but they’re also leaders in how to adapt to changing weather conditions and transition to renewable energy. That’s the conclusion of a new report published by the Institute of Tribal Environmental Professionals at Northern Arizona University. KNAU’s Melissa Sevigny spoke with two of the report’s authors, Nikki Cooley and Kelsey Morales.


Human rights groups are calling on the Biden administration to consider the effects of climate change-driven heat on migrants when designing the government's border policies. Human Rights Watch this week released a letter sent by 68 groups to the U.S. government, urging a new approach to actions on the southwestern border after this summer’s deadly heat. The Southwest has become one of the fastest warming regions in the U.S. due to climate change.

AP Photo/Eugene Garcia, File

Human rights groups are calling on the Biden administration to consider the effects that climate change-fueled heat has on migrants when designing the government's border policies. 


U.S. Forest Service, Coconino National Forest

More than five and a half million acres have burned in the U.S. this year. Wildfires have grown larger and more intense over the last few decades, in part because of the warmer temperatures brought on by global climate change. Residents in forest cities like Flagstaff increasingly have to prepare for evacuations, smoky days, and post-fire floods. KNAU’s Melissa Sevigny reports, all that takes a toll on mental health.

Researchers from the Institute of Tribal Environmental Professionals this week released a report on the State of Tribes and Climate Change. It examines the disproportionate effect climate change has on Indigenous people, lands and culture, as well as the added strain tribes experience as they respond to damaging climate events. The STACC report builds on another report released in August by the Intergovernmental Panel on Climate Change, or ITEP, a tribal institute at Northern Arizona University.

Rapids are returning to lower Cataract Canyon in southern Utah after decades underwater in the far-upper reaches of Lake Powell. The damming of the Colorado River in Glen Canyon in the 1960’s submerged the river’s channel and native vegetation. But climate change, extended drought and extreme heat have caused Lake Powell’s water level to drop to new lows, revealing the once-submerged rapids.

Sheila Murray

A team of botanists with the Arboretum at Flagstaff just finished a two-year survey of three rare plant species found at Capitol Reef National Park in southern Utah: the endangered Wright’s fishhook cactus, the threatened Winkler’s pincushion cactus and the Last Chance Townsend Daisy.