Baltic Sea as species in 2005 and 2018 respectively, having formerly been confused with more widespread relatives. The tiny Copenhagen cockle ("Parvicardium hauniense"), a rare mussel, is sometimes considered endemic, but has now been recorded in the Mediterranean. However, some consider non-Baltic records to be misidentifications of juvenile lagoon cockles ("Cerastoderma glaucum"). Several widespread marine species have distinctive subpopulations in the Baltic Sea adapted to the low salinity, such as the Baltic Sea forms of the Atlantic herring and lumpsucker, which are smaller than the widespread forms in the North Atlantic. A peculiar feature of the fauna is that it contains a
History of the North Sea significant Cold War confrontation began in the Baltic. Its economic importance grew in the 1960s as surrounding countries began to exploit oil and gas resources. The largest environmental catastrophe in the North Sea was the destruction of the offshore oil platform Piper Alpha in 1988 in which 167 people lost their lives. Although de facto control of the North Sea played a decisive role in the political power relationships in north-west Europe since the time of the Vikings, and became a question of world politics after the First Anglo-Dutch War, until after the Second World War the bordering countries officially