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
