Habitat destruction and the direct exploitation of species often occupy center stage in discussions of biodiversity perils. However, indirect harms, such as that posed by nitrogen pollution, remain underappreciated and poorly …From: phys.org

GR:  Nitrates from farm fertilizers have polluted freshwater in many regions across the Earth.  Nitrogen is particularly dangerous for babies and for the eldery of all species.  Where I live, downstream from a farm, we have always filtered the water.  Sadly, the fish, amphibians, birds, and mammals that live here must drink the polluted water to live.  We understand the toxic effects of nitrogen, but we can only guess at how much this one human waste has changed and shortened wildlife lives.