Northern Arizona is famous for its aspen trees, and a multi-decade study looks into how they’re being affected by climate change. Among the findings: There are a good number of smaller, younger aspens and a good number of older ones,

The Trump administration is also ending federal requirements that push car makers to produce more low-emission models.Start the day smarter. Get all the news you need in your inbox each morning.

First-week orders could undermine progress on clean energy investments, pollute the air and add few benefits to the economy, especially in Arizona.

The Phoenix mayor said withdrawing from the global agreement to fight climate change would harm public health and economic prosperity.

Experts say Trump's moves to step away from global climate action, ramp up domestic oil and gas production and remove incentives for electric vehicles are worrisome. The planet continues to heat up; 2024 was Earth's hottest year on record,

The study highlights the urgent need to safeguard global tropical wetlands from human impact. Complex organisms, thousands of times smaller than a grain of sand, play a critical role in shaping massive ecosystems and influencing Earth's climate,

Climate scientist Ben Hamlington works on understanding the impacts of climate change. Losing his house in the Eaton Fire has given that work new meaning.

The orders could affect Arizona through their impact on climate change and potential harm to the electric vehicle industry. There are no significant proven oil or gas reserves in Arizona ...

Experts say Trump’s moves to step away from global climate action, ramp up domestic oil and gas production and remove incentives for electric vehicles are worrisome as the planet continues to heat up. 2024 was Earth’s hottest year on record, and climate scientists say the rising heat is contributing to extreme weather affecting millions.

House committee passes bill that would outlaw cloud seeding and climate intervention research after supporters cite debunked conspiracy theories

While there might not be as many freshwater species, Northern Arizona University researchers say it would still hurt areas like the Colorado River.