A record-breaking race car powered by a hydrogen fuel cell offers proof that development of alternative-energy vehicles is well underway.

To fight an invasive bug that's devastating hemlock trees in Appalachia, scientists are siccing other alien insects on the offender.

The winning pictures in this year's Visions of Science Photographic Awards take you from the depths of the Caribbean Sea to the surface of a cancer cell.

The amount of ice in the Arctic Ocean has shrunk to its lowest level in a century, research shows, and experts warn that the melting could continue.

A month after Hurricane Katrina tore through the U.S. Gulf Coast, medical experts are now struggling with the latest crisis in the region: disease-infested sludge, toxic sediments, and widespread mold.

Humans and other mammals have flourished on the Earth, and a study says one important change in their environment may help explain why: a large increase in the concentration of atmospheric oxygen.

South Dakota's inaugural cougar hunting season begins Saturday. Is it a managed recreational opportunity or a threat to big cat survival?

Researchers in Idaho have found a way to use sheep to rid vast swathes of U.S. sagebrush lands of invasive weeds.

Hurricane Rita became a monster of a storm as it gathered strength over the Gulf of Mexico. Follow the path of the powerful hurricane in this video timeline.

Without homes after nearly a month, victims of Hurricane Katrina tell stories of survival, charity, violence, and newfound love.

A new, highly contagious respiratory virus thought to affect only the greyhound racing industry is now being detected in family dogs.

Hurricane Rita was a fearsome monster of a storm as it plowed across the warm waters of the Gulf of Mexico last week. By the time it made landfall in southweatern Louisiana, millions of Gulf Coast residents had fled inland in anticipation of disaster.

What remains of Hurricane Rita continued to soak parts of the U.S. South on Sunday, while communities on the Gulf Coast began the work of drying out and cleaning up.

The storm-tattered Gulf Coast took another direct hit from a powerful hurricane when Hurricane Rita made landfall in southwestern Louisiana early Saturday morning with winds approaching 120 miles an hour.

Get the latest news updates, photo galleries, and video reports on Gulf Coast regions affected by Hurricane Rate.