Polar Bears Listed as Threatened Species in U.S.
The bears, which rely on Arctic sea ice, are now protected under the Endangered Species Act, but officials emphasize that the decision will not be used to determine U.S. climate policy.

  Youngest Supernova in Milky Way Found
Thought to have exploded just 140 years ago, the supernova will allow scientists the rare chance to observe an astronomical event in action.

  Tourists, Pandas Safe After Quake; Local Towns Leveled
Landslides have prevented rescuers from entering much of the remote, mountainous region near the Wolong National Nature Reserve where many villagers have died.

  Myanmar Cyclone a "Catastrophe" for Wildlife
The urgent need for food and shelter resulting from the disaster could have a devastating impact on forests and wildlife, conservationists warn.

  Heavy Rains Barrel Toward Cyclone-Hit Myanmar
As another potentially powerful storm heads for the devastated delta, relief agencies warn about a second wave of deaths.

  VIDEO: Rare Dead Sea Scroll Displayed
A small, fragile piece of a 2,000-year-old Dead Sea scroll was shown briefly to visitors at a Jerusalem conference.

  VIDEO: Quake Panic Filmed
Two amateur videos taken in Chengdu, China—near the epicenter of Monday's devastating earthquake—show people running in panic as the ground shakes.

  Mysterious Ailment Could Wipe Out U.S. Northeast Bats
Scientists hope the summer emergence of pregnant females can shed some light on the enigmatic white-nose syndrome—before time runs out for the animals and their environment.

  One Degree of Warming Having Major Impact, Study Finds
An exhaustive analysis of data from about 30,000 physical and ecological systems shows that human-induced climate change is already having a dramatic effect on the planet.

  Mars Lander Team Prepares for "Seven Minutes of Terror"
Two weeks before the Mars Phoenix Lander is slated to touch down, scientists say they are ready for the critical descent phase that could make or break the mission.

  U.S. Major Importer of Illegal Asian Timber, Study Says
Vietnam has become a hub for processing Asia's illegally logged timber, much of which is sold in the United States as outdoor furniture, conservationists say.