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Another high-profile clean air case played out yesterday in the U.S. Court of Appeals for the District of Columbia Circuit.

Year after year, EPA has proved itself the most cost-effective agency in the federal government.

With air pollution as with speeding tickets, a penalty for not following the law makes you more careful in the future.

To convince people of the reality of climate change, trying being boring.

Amazon's indigenous people see early effects of climate change.

How nature slowly turned a cantakerous businessman into a committed conservationist.

Several counties in are simply not making American Lung Association's grade.

EDF looks forward to Ms. Pritzker’s leadership as secretary and will continue to work with fishermen, regional councils and NOAA.

We’re approaching a concentration of CO2 in the atmosphere not seen in 2-3 million years.

Policies that put a price on carbon emissions are the key to effective action on global warming.

The American Lung Association’s “State of the Air” report has the answer.

New studies show that ubiquitous chemicals called PFCs may have serious effects on our health. Here’s a brief overview of those effects.

It's time the country got the protection it deserves from dangerous chemicals.

Getting Americans to try under-appreciated fish species.

The nation is in a race to build a clean energy economy, and the big energy companies are holding us back.

Nothing brings home the reality of global warming like the birth of a new child.

When it comes to managing fish populations, you need big fish, little fish and in-between fish -- just the way nature intended.

Increasingly, climate change is an issue that helps define politicians in the eyes of voters.

Cuba and the U.S. share a love of baseball. They also share a common environment.

Big coal goes to the Supreme Court in an effort to stop EPA's clean car regulations.