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

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.

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 ...

Rep. Lisa Fink said she understands geoengineering can be controversial and some people attach it to the “chemtrails” conspiracy theory.

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

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

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,

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

President Trump's first week in office included a flurry of executive orders with implications for Earth's climate and environment.

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 Old Farmer's Almanac, which has been in business since 1792, recently released its spring weather forecast. The outlook? "Warmer-than-normal temperatures for most of the country, with a few exceptions: southern and central California, Desert Southwest, southern Florida, and western Ohio Valley, where it will be near to below normal."