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,

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

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

Kyle Paoletta's new book takes readers on a scenic road trip from the desert region's under-appreciated past to its uncertain future.

Climate change is making Phoenix increasingly unsafe for outdoor workers like my dad. We need protections from the heat now more than ever.

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

Despite a red wave sweeping across America last November, a green wall is descending over part of the country. As President Trump took the oath of office last week, his administration renewed its comm

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