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 ...

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

Seeking decadent a holiday balanced by high-energy activities, Benjamin Parker flew to Arizona’s on-trend desert gem to see what’s going on years after the likes of Humphrey Bogart and Marilyn Monroe

Though the Republicans controlled both houses of Congress during Trump’s first two years, the party had not yet been turned into a full-on personality cult. Senator John McCain, for instance, famously prevented Trump from repealing Obamacare,

One of the shyest animals in the region is the Mount Lyell shrew. As Smithsonian reports, the tiny mammal was finally caught on camera for the first time since it was identified about 100 years ago. To capture the historic images,

A new analysis from the National Oceanic and Atmospheric Administration said Punxsutawney Phil came in near the bottom of a pack of long-time U.S.-based animal forecasters.

More than 1 million people could pour into western Maricopa County in the coming decades – if housing developers can secure the water.

It's actually good news that NASA spotted a sizable asteroid with a (small) chance of hitting Earth in 2032. It means our asteroid-sleuthing telescopes are working.

Doug Burgum will be the point person for public land management and President Trump’s “drill, baby, drill" agenda to expand oil and gas development.