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A firefighter wades through the crude on July 20 to save fellow firefighters during oil spill cleanup operations in Dalian, China.

Photo: ZUMA Press

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Dalian oil spill

A firefighter wades through thick crude on July 20 to save fellow firefighters during oil spill cleanup operations in Dalian, China.

The oil spill was caused by a pipeline blast at the port in Dalian, causing severe threats to coastal waters, ecosystems and marine life.