Frogs are harvested as food by the millions every year. A new study shows that uncontrolled frog hunting could drive some populations to extinction by midcentury.

How should the United States power its economy in 2050? A recent survey finds surprising agreement from Americans of all political stripes.

After a 5-year review, the EPA is leaving US standards for fine particle air pollution unchanged, even though recent studies suggest that tightening them could save thousands of lives yearly.

The Deepwater Horizon disaster set new records for holding polluters to account. But it had much less impact on laws regulating offshore drilling or US oil dependence.