"The top U.N. climate official said Wednesday that though the Copenhagen global warming summit went sour, countries should avoid blaming each other and get down to work on a better deal next year."

The first case of Marburg virus, a deadly relative of Ebola, has been reported in North America. A Colorado traveler brought it home after contact with bats in a cave in Uganda.

When plants are eaten -- especially by insects -- they emit a number of signals that might be seen as howls of alarm, and exhibit responses seemingly meant to stop the carnage. Whether or not this troubles vegans, it fascinates scientists.

"In the Pacific, jumbo squid have moved to new waters, signaling changes in the ocean, scientists observe."

The price of tradeable carbon allowances fell on the EU market in response to failure of the U.N. climate talks to deliver strong limits on carbon dioxide emissions.

"COPENHAGEN — By early Saturday morning, the atmosphere at the European Union pavilion at the Bella Center had turned funereal."

"When two weeks of climate negotiations finally wound to an overtime finish in Copenhagen, the goal of a new binding treaty to combat global warming still looked elusively far away. And, even for climate activists, the question was: 'Is that so bad?'"

"After two weeks of delays, theatrics and last-minute deal-making, the United Nations climate change talks concluded here early Saturday morning with a grudging agreement by the participants to “take note” of a pact shaped by five major nations."

"Up to a fifth of all species of animals and plants risk extinction even if the world manages to limit global warming to levels widely viewed as safe, the head of the Convention on Biological Diversity said."

"Carbon emissions cuts pledged at U.N. climate talks would put the world on 'an unsustainable pathway' toward average global warming 50 percent higher than industrial countries want, a confidential U.N. draft document showed Thursday."