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In this Sept. 23, 2009 photo, a riverside view of Ho Chi Minh city center that is located along the Saigon River in Vietnam is shown. Sea levels rising because of global warming, along with increased storminess as the climate changes, will expose tens of millions of people in the world's port cities to coastal flooding, says a report by the Organization for Economic Cooperation and Development. (AP Photo/Le Quang Nhat) Le Quang Nhat/AP