The Baltic Sea is one of the most polluted bodies of water on Earth. Nutrient runoff causes algal blooms, depleting oxygen and making water dark and murky. Urban litter and industrial chemicals that end up in the sea harm its ecosystems. Overfishing and climate change have also added their own long-term effects. Stocks of species like Baltic Cod have collapsed, disturbing the fishing industry across the region.

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https://www.euronews.com/green/2021/09/28/europe-starts-cleaning-up-its-act-to-save-the-baltic-sea