Two-thirds of the world's polar bears will vanish in less than five decades as sea ice melts due to a warming climate, a suite of U.S. government studies concludes.
The Mekong catfish travels more than 600 miles (1,000 kilometers) upriver to spawn—a discovery that means a planned dam on the river might spell disaster for the species.
More than 60 million people in the northern Indian Ocean may be at risk of a tsunami as big as the one that struck Indonesia on December 26, 2004, scientists say.
Felix pounds Central America as Henriette hits western Mexico, marking the first time Atlantic and Pacific storms have struck on the same day since the 1940s.
Gaining strength as it roared toward Central America, Felix slammed into the swampy coast between Nicaragua and Honduras as a powerful Category 5 storm.
Ancient cave formations found in Israel provide the first concrete evidence that a change in rainfall allowed early humans to migrate out of Africa, experts say.
A survey of the Iriomote cat, believed to number fewer than a hundred in 1994, is offering evidence that the cat's already small population is shrinking, experts warn.
