Eutrophication, abnormal nutrient enrichment in aquatic ecosystems causing algal blooms and anoxia, causes fish kills, loss of biodiversity, and renders h2o unfit for ingesting as well as other industrial utilizes. Abnormal fertilization and manure application to cropland, and also high livestock stocking densities cause nutrient (largely nitrogen and phosphorus) runoff https://thefarmingblog.blob.core.windows.net/the-farming-blog/index.html