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

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.

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 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 ...

Artist Charles Gaines doesn't want to tell you what to think; he wants his work to inspire viewers to think for themselves.

The Republican-controlled Senate has confirmed Lee Zeldin as administrator of the Environmental Protection Agency.

The Republican-controlled Senate on Wednesday confirmed Lee Zeldin to lead the Environmental Protection Agency.

Arizona is gearing up for a potential legal showdown to safeguard its water rights amid growing tensions over the Colorado River's dwindling supply.

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,

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

New research from a team of tropical biologists forecasts some of the changes that may occur in the Amazon rainforest as temperatures rise due to climate change.

More than 100 participants attended the first diocesan Creation Summit at St. Francis Xavier Parish in Phoenix on Jan. 25. This interfaith event welcomed Catholics, Buddhists and other non-denominational groups from Prescott,