Oil pollution. Oil covering rocks on a shoreline. The oil is brown rather than black because it comes from a slick which had a chemical dispersant added to it. This dispersant has turned the slick into a mixture of oil, water and dispersant. Oil slicks particularly affect sea birds and creatures living on the shoreline. Although chemical dispersants can reduce the size of the slick, these detergents are also poisonous to wildlife. This slick originated in a spill of about 70,000 tonnes of light crude oil from the oil tanker Sea Empress off the coast of Milford Haven, Wales, in February 1996. Photographed in Swanlake Bay, Wales.
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