China's coastal waters are suffering "acute" pollution, with the size of the worst affected areas soaring by more than 50 percent last year, an official body said.

The State Oceanic Administration (SOA) said 68,000 square kilometers (26,300 square miles) of sea had the worst official pollution rating in 2012, up 24,000 square kilometers on 2011.

Japanese researchers said Thursday they have found a rich deposit of rare earths on the Pacific seabed, with reports suggesting it could be up to 30 times more concentrated than Chinese reserves.

Mud samples taken from 5,800 meters (19,000 feet) below the waves contained highly concentrated amounts of the precious minerals, which are vital for high-tech manufacturing and used in products including wind turbines and iPods.

Five Greenpeace activists on Thursday chained themselves to Jerusalem's soaring Bridge of Strings demanding that U.S. President Barack Obama halt exploratory drilling in the Arctic, an Agence France Presse correspondent said.

Wearing white overalls and yellow helmets, the five used climbing gear to inch up the metal cables which spans a busy intersection at the entrance to the city.

Researchers in Germany said Tuesday they have completed the first high-quality sequencing of a Neanderthal genome and are making it freely available online for other scientists to study.

The genome produced from remains of a toe bone found in a Siberian cave is far more detailed than a previous "draft" Neanderthal genome sequenced three years ago by the same team at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany.

Hong Kong is one of the world's worst cities for light pollution with night skies around 1,000 times brighter than globally accepted levels, researchers said Wednesday ahead of this year's Earth Hour event.

A study by Hong Kong University found that brightness levels in the southern Chinese city's popular shopping district of Tsim Sha Tsui were 1,200 times greater than the international dark sky standard -- a measurement void of manmade light.

Scientists on Wednesday announced they had peeked into the DNA of the giant squid, seeking to demystify a deep-sea creature that has haunted sailors' dreams for centuries.

But their findings published Wednesday threw up some tantalizing questions in turn.

Seven Komodo dragons have hatched under a breeding program at an Indonesian zoo, an official said Wednesday, a success story that raises hope for the endangered lizard.

Twenty-one eggs from two Komodo dragons were placed in incubation at the Surabaya Zoo in eastern Java, the first batch in September and the second in October, with seven hatching on March 10.

Recycling of household waste has tripled in Europe over the past decade but some countries are dragging their feet for meeting a target set for 2020, the European Environment Agency (EAA) said in a report issued on Tuesday.

From 2001 to 2010, recycling of materials and composting of organic waste in the 27 nations of the European Union (EU) rose from 13 percent of the total to 39 percent.

The Mars rover Curiosity is sidelined again, further delaying the restart of science experiments, after recovering from a computer problem.

The latest complication occurred over the weekend when the six-wheel rover entered safe mode after experiencing a software file error.

Greener cars that use alternative fuels could help the United States slash its greenhouse gas emissions from everyday driving a full 80 percent by 2050, according to a scientific study out Monday.

That could lead to a more than 13 percent cut in overall U.S. pollution into the atmosphere, with consumer-driven cars and small trucks currently responsible for 17 percent of the nation's greenhouse gas emissions, said the study.