One of the reasons for the global threat to biodiversity is that we humans introduce more nutrients into our environment than would naturally be present there, for example, when fertilizing agricultural land. In addition, precipitation re-distributes excess nutrients to other areas, and nutrients can also enter our soils through air pollution.
source https://www.lifetechnology.com/blogs/life-technology-science-news/more-yield-fewer-species-how-human-nutrient-inputs-alter-grasslands