Visitors to Hawaii Volcanoes National Park stand atop an old cinder cone to watch an ash filled plume of sulfur dioxide gas and ash rising from the Halemaumau crater of Kilauea volcano on Wednesday, March 26, 2008. Big Island Mayor Harry Kim says it may be necessary to evacuate some areas around the volcano because the release of 2,000 tons of toxic gas into the air every day is causing concern for the health and safety of nearby residents. (AP Photo/David Jordan)

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