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Dead zones

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South China Sea – This coastal zone is currently home to 270 million people, which is expected to double over the next 30 years. Population growth leads to urban runoff and sedimentation; moreover, this is a major oil shipping route. Oil spills have caused a great deal of marine life degradation, aggravated by overfishing and the destruction of mangrove trees for development and shrimp farming. (Source: Encyclopedia of the Earth, South China Sea World Wide Web Virtual Library)

PHOTO: Newscom/File

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