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,

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

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.