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 ...

Environmentalists and farmers are challenging Arizona's approval of an air pollution permit for Copper World Mine, claiming it's lax on toxic dust.

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,

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

Democratic Arizona Gov. Katie Hobbs is renewing a push to regulate groundwater in rural parts of the drought-stricken state.

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.