Humans outpollute nature in 25% of coastal waters
A new study indicates that human-driven nitrogen pollution now exceeds natural sources in 25% of the world's coastal waters. This nutrient overload can lead to harmful algal blooms, oxygen depletion, and the creation of 'dead zones' that threaten marine ecosystems and local economies.
Why it matters
Coastal ecosystems are vital for global food security and economic stability; understanding the sources of pollution is essential for effective environmental management.
Coastal waters that feed billions of people with food, jobs and recreation are being pushed past their limits by a surge of human-made nitrogen. A new studytitled 'Coastal Nitrogen, Phosphorus, and Silicon Sources: Integrating Land, Sea, and Human Inputs' led by Washington State University estimates that in about one in four of the planet’s coastal waterways, people now add more nitrogen than all natural sources combined, with the Gulf of Mexico standing out as a major hotspot. The research, published in Global Biogeochemical Cycles, maps how agriculture, wastewater, urban runoff and fossil fuel emissions are reshaping nutrient balances along shorelines and identifies where cuts in pollution could deliver the biggest gains for marine life and human health.Why nitrogen matters in coastal seasNitrogen, phosphorus and silicon are essential nutrients that fuel the growth of plankton, seagrasses and other marine life.
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