Despite improvements in air quality in past decades, 156 million Americans still breathe in too much soot or ozone, says the annual State of the Air report from the American Lung Association.

California has long had a waiver from the Clean Air Act that allows the state to set its own stricter tailpipe emissions. But now, fuel companies are suing.

A lawsuit alleges the Trump administration violated the free-speech rights of nonprofits and municipalities that have had federal funding for climate and environmental projects frozen or cancelled.

Thirty artists release songs with nature sounds to generate royalties for nature conservation in second annual United Nations Earth Day mixtape.

At a time when communities feel fractured, here's a look at online communities taking a pragmatic approach to changing the world for the better.

The Trump administration is reinterpreting a key word in the Endangered Species Act that could have big consequences for the habitats of species at risk.

Following a lithium-ion battery fire at the Moss Landing plant in Monterey County in California, communities nationwide are expressing concerns about hosting similar plants.

The president signed four executive orders to reverse the trend away from coal-fired electricity in the U.S., but there's little economic incentive for utilities to bring it back when natural gas is so much cheaper.

Prosecutors say the operation was aimed at gathering information to foil lawsuits against the fossil fuel industry over damage communities have faced from climate change.

Riverbank stabilization, lead and asbestos contamination are just some of the projects tribes planned to address before the Trump administration froze funds.