Some have suggested that N. ceranae alone might be sufficient to cause CCD, as the fungus is believed to have been widespread since 2006, when CCD first became a problem.

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Last week, the U.N. warned that the loss of NGOs in Sudan would cause 1.1 million people to go without food aid and health care, and more than 1 million to have no access to water.

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U.N. scientific experts say a warmer world is likely to spread disease in tropical regions, cause sea levels to rise and increase the rate of severe storms.

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