spent on Robben Island, a forbidding outpost off the coast of Cape Town where Mandela and other prisoners spent part of the time toiling in a stone quarry. The elderly are especially vulnerable to pneumonia, which can be fatal. Its symptoms include fever, chills, a cough, chest pain and shortness of breath. Many germs cause pneumonia. South African officials have said doctors were acting with extreme caution because of Mandela's advanced age. In Saturday's statement, Zuma thanked the medical team and hospital staff that looked after Mandela and expressed gratitude for South Africans and people around the world who had shown support for Mandela. The South African government has sought to balance efforts to satisfy wide public interest in Mandela's condition with an intense campaign to preserve the privacy of an ailing figure who already has his place in history. An insider's guide to politics and policy, available on the iPad or as a PDF download.[标签:标题]
By NICK PERRY and ROD McGUIRK,toms shoes discount, Associated Press WELLINGTON, New Zealand (AP) Nancy Bertler and her team took a freezer to the coldest place on Earth, endured weeks of primitive living and risked spending the winter in Antarctic darkness, to go get ice ice that records our climate's past and could point to its future. They drilled out hundreds of ice cores, each slightly longer and wider than a baseball bat, from the half-mile-thick ice covering Antarctica's Roosevelt Island. The cores, which may total 150,toms outlet,000 years of snowfall, almost didn't survive the boat ride to New Zealand because of a power outage. Bertler hopes the material will help her estimate how long the Ross Ice Shelf would last under the current rate of climate change before falling apart. Evidence from the last core her team hauled out needs further study, but it contains material that Bertler said appeared to be marine sediment that formed recently at least in geological terms measured in thousands of years. That would bolster scientists' suspicions that the shelf could collapse again if global temperatures keep rising, triggering a chain of events that could raise sea levels around the world. "From a scientific point of view, that's really exciting. From a personal point of view, that's really scary," said Bertler,cheap toms shoes, a senior research fellow at the Antarctic Research Centre at the Victoria University of Wellington. The ice shelf acts as a natural barrier protecting massive amounts of ice in West Antarctica, and that ice also could fall into the ocean if the shelf fell apart. Scientists say West Antarctica holds enough ice to raise sea levels by between 2 meters (6.5 feet) and 6 meters (20 feet) if significant parts of it were to collapse. Ted Scambos, the lead scientist at the National Snow and Ice Data Center at the University of Colorado, said that even under the worst case scenario he thinks it would take at least 500 years for West Antarctica's ice to melt. However, he said a discovery of sediment would indicate a significant portion of the ice shelf is under threat of becoming unstable ag Related articles:

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