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Twenty-five "healthy young persons" were exposed to different concentrations of nitrogen dioxide for hours as part of a study for the car manufacturers. The gas can cause respiratory problems.

Coral in an area in the Atlantic Ocean stretching from Connecticut to Virginia has been protected from deep-sea commercial fishing gear, by a new rule issued this week.

Huge windmills -- promoted as a source of clean, renewable power -- are sprouting up on mountaintops in the Appalachian states. But some local opponents say the tall turbines blight the rural landscape.

A wide range of Latino communities in the United States are affected by climate-driven storms, floods, droughts and heat waves, and are leading the charge to address global warming.

The rules would lower emissions of mercury and other toxic pollutants that can harm brain development of young children and contribute to heart attacks and other health problems in adults.

Despite a daily cleanup that leaves the post-parade landscape remarkably clean, uncaught beads dangle from tree limbs like Spanish moss and get ground into the mud under the feet of passers-by.

The talks in Canada are not going well,and scientists and civil society groups say the U.S. is largely to blame.

Champion distance runner Lauren Fleshman says too many coaches assume — falsely — that what works for male athletes also benefits female athletes. Her memoir is Good for a Girl.

Oil and natural gas prices are still low so companies are looking to save money. The 2,800 represent about 3 percent of the combined workforce.

President Trump is expected to sign into law sanctions against companies building a natural gas pipeline from Russia to Germany.