The first video of life on Arctic sea ice from a polar bear point of view has been released by the U.S. Geological Survey.

The agency on Friday released a clip recorded by a camera attached to the collar of a female polar bear without cubs in the Beaufort Sea north of Prudhoe Bay, Alaska. The necks of polar bear males are wider than their heads and collars slide off.

The U.S. space agency NASA has been warned that its mission to send humans to Mars will fail unless its revamps its methods and draws up a clear, well-planned strategy to conquer the red planet.

The National Research Council said in a congressionally-mandated report that Washington should use "stepping stones" to achieve its goal of a manned flight to Mars.

German scientists said Thursday that moon samples collected during the 1960s and 1970s have shown new evidence that the moon formed when a young Earth collided with another celestial body.

The smashup between an early form of Earth and a planetary body named Theia some 4.5 billion years ago is put forth by what scientists call the Giant Impact Hypothesis of moon formation.

Scientists have mapped the entire genome of sheep, paving the way to improve the health of the humble farm animal for better meat and wool.

After eight years of work on the entire genetic makeup of the species, the researchers also found the secrets of the sheep's digestive system and unique fat metabolism process that allows it to produce and maintain its thick coat.

An Australian plan to limit future port developments on or near the Great Barrier Reef to five areas was Friday criticized as "business as usual" and "destructive" by conservationists.

Queensland Infrastructure Minister Jeff Seeney said late Thursday the state's strategy would see future port developments centred on Townsville, Abbot Point, Hay Point and Mackay, Gladstone and Brisbane. 

The United Nations seized World Environment Day Thursday to demand action on climate change to protect small island states threatened by rising seas, drought and floods.

"We have very, very alarming news from science," U.N. climate chief Christiana Figueres told reporters in Bonn at a new round of talks on global warming.

Kenya's embattled wildlife service announced Thursday the discovery and seizure in the port city of Mombasa of a huge haul of ivory from at least 114 poached elephants.

The find of 228 tusks and 74 ivory pieces is thought to be biggest of its kind so far this year, the Kenya Wildlife Service (KWS) said.

Criminals' days may be numbered after Dutch forensic experts discovered how to accurately date fingerprints, a breakthrough that could one day let police date crime scene prints from years ago.

"It's not quite the Holy Grail of fingerprinting, but it's a very important discovery," Marcel de Puit, fingerprint researcher at the Dutch Forensic Institute (NFI), told Agence France Presse on Wednesday, hailing what he said was a world's first.

By absorbing carbon emissions from the atmosphere, the seas avert climate damage worth up to $222 billion (163 billion euros) every year, according to an estimate released on Thursday.

Fish catches are worth another $16 billion annually, according to the report by a non-governmental watchdog, the Global Ocean Commission, which hopes that by setting an economic price on the value of international waters, the bounty will be better managed.

Gray wolves roaming into California from Oregon will have added protections now that a state board has listed the species as endangered despite other parts of the country relaxing rules on hunting the iconic predator.

The California Fish and Game Commission's vote Wednesday came as biologists announced that an Oregon wolf famous for hopscotching between the two states has fathered pups within about 50 miles (80 kilometers) of the border, making it a matter of time before more wolves make California home.