Antarctic ice riddle keeps sea-level secrets

Alister Doyle

A deep freeze holding 90% of the world's ice, Antarctica is one of the biggest puzzles in debate on global warming with risks that any thaw could raise sea levels faster than United Nations projections. Even if a fraction melted, Antarctica could damage nations from Bangladesh to Tuvalu in the Pacific and cities from Shanghai to New York.

Antarctica on alert for aliens

Alister Doyle

Aliens are landing in Antarctica: seeds, spores, mites, lichens and mosses alien to the continent have been brought unwittingly by scientists and tourists, and could disrupt life in the icy wilderness. Antarctica is best known for penguins as well as seals and whales, but scientists are finding a host of other tiny organisms, from springtails -- closely related to insects -- to mosses.