NASA has identified several hundred marine dead zones around the world. A dead zone is an area in the ocean where the oxygen level is too low for marine life to survive. Some of them occur naturally, but most of them are man-made. Seven out of the world’s ten largest dead zones are in the Baltic Sea. The biggest dead zone in the Baltic Sea is almost the size of Ireland.
Reportage: Daniel Hager
Research: Loke Nyberg
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