Finding other people on the Arizona Trail is energizing, but people are also changing the trail along its final miles.

Will people continue to hike and bike the Arizona Trail? Extreme weather and land use challenges may test the limits.

The golden toad was declared extinct in 2004, the victim of climate change, scientists said in 2022. But Trevor Ritland ...

When I moved to Arizona in 1990, I thought I was escaping a life of allergies. Fat chance. I was told that the state had introduced too many non-indigenous plants, and that instead of finding relief ...

Valley fever's reach is predicted to expand northward across the Western U.S. due to hotter, drier conditions. Rising global temperatures may enable fungi to survive at higher temperatures, ...

PHOENIX (KPNX) — If you feel like allergy season never seems to end, you’re not imagining it. Across the U.S., and right here in Arizona, climate change is making pollen problems worse — and ...

Researchers at Northern Arizona University and the Smithsonian found an unconventional method to understand how rainforests will survive with climate change—making tea with living leaves at the top of ...

The University of Arizona will head the Southwest Climate Science Center, one of eight regional centers being set up by the U.S. Department of the Interior to assess the impact of climate change on ...

After fending off cancer for 17 years, Hazel Chandler, one of Phoenix's most memorable environmental advocates, has died. She was 80.

Integrating climate literacy into higher education helps students learn to address environmental challenges in their careers ...

You love your morning coffee and you love the planet. So, you might wonder what your caffeine habit means for climate change.