地理漫步·世界地理英语30篇（4）
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The Baltic Sea: A Semi-Enclosed Sea Facing Eutrophication
波罗的海：面临富营养化的半封闭海域
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The Baltic Sea receives freshwater from 250 rivers but exchanges saltwater slowly with the North Sea.
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Its low salinity supports unique brackish-water species found nowhere else on Earth.
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Agricultural runoff rich in nitrogen and phosphorus triggers massive algal blooms each summer.
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Dead zones—oxygen-depleted areas—now cover over 60,000 square kilometers annually.
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Fishermen report declining cod stocks linked to warmer, less-oxygenated deep waters.
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The Helsinki Commission coordinates pollution reduction across nine riparian countries.
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Wetland restoration along coastlines filters nutrients before they reach open water.
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New EU regulations limit fertilizer use and mandate buffer strips near waterways.
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Citizen science projects map bloom locations using smartphone apps and satellite alerts.
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Eco-labeling for sustainable seafood helps consumers support responsible fishing practices.