utants entering the sea from the long line of catastrophic oil spills appeared pared with those of pollutants introduced directly and indirectly from other sources (including domestic sewage, industrial discharges, leakages, urban and industrial run-off, accidents, spillages, explosions, sea dumping operations, oil production, mining, agriculture nutrients and pesticides, waste heat sources and radioactive discharges). Nutrient pollution from sewage discharges and agriculture can result in unsightly and possibly dangerous "blooms" of algae in coastal waters. As these blooms die and decay they use up the oxygen in the water, this led, in some areas, to "creeping dead zones". Radioactive pollution has many causes, including the normal operation of nuclear power stations. Radioactive elements
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