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<p>In this July 19, 2007, photo, an iceberg is seen as it melts off Ammassalik Island in Eastern Greenland. The U.S. Geological Survey estimates the Arctic region holds up to one-quarter of the world's undiscovered conventional oil and natural gas, including 90 billion barrels of crude, most of it is offshore. Companies in the U.S., Russia, Norway, Denmark and Canada are stepping up preparations to drill there.</p>

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World's thirst for oil leads to risks
November 5, 2010 9 p.m.

World's thirst for oil leads to risks

MIAMI - The world's thirst for crude is leading oil exploration companies into ever deeper waters and ventures fraught with environmental and political peril.