Earth

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Athens, Ga. – Scientists have known for two decades that sulfur compounds that are produced by bacterioplankton as they consume decaying algae in the ocean cycle through two paths. In one, a sulfur compound dimethylsulfide, or DMS, goes into the atmosphere, where it leads to water droplet formation – the basis of clouds that cool the Earth. In the other, a sulfur compound goes into the ocean's food web, where it is eaten and returned to seawater.

What they haven't known is how sulfur is routed one way or the other or why.

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DURHAM, N.H. – Marine species facing threats from the 2010 BP Deepwater Horizon oil spill in the Gulf of Mexico far exceed those under legal protection in the United States, a new paper in the journal BioScience finds. University of New Hampshire professor Fred Short and others found 39 additional marine species beyond the 14 protected by federal law that are at an elevated risk of extinction. These species, which range from whale sharks to seagrass, should receive priority for protection and restoration efforts, the authors advocate.

A new analysis emphasizes the large variability in greenhouse gas emissions from alternative fuels. In an effort to combat soaring fuel prices and cut greenhouse gas emissions, the aviation industry is racing toward the use of biofuels. In 2008, Virgin Atlantic became the first commercial airline to fly a plane on a blend of biofuel and petroleum. Since then, Air New Zealand, Qatar Airways and Continental Airlines, among others, have flown biofuel test flights, and Lufthansa is racing to be the first carrier to run daily flights on a biofuel blend.

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MOSS LANDING, CA — The first comprehensive study of the biological effects of Antarctic icebergs shows that they fertilize the Southern Ocean, enhancing the growth of algae that take up carbon dioxide from the atmosphere and then, through marine food chains, transfer carbon into the deep sea. This process is detailed in 19 new research papers published electronically in a special issue of the journal Deep Sea Research Part II: Topical Studies in Oceanography.