Although eutrophication is a natural phenomena in lakes, estuaries, and other aquatic ecosystems, human activities can greatly accelerate the process. Human agricultural activities, in particular deliberate fertilization of fields, can result in significant runoff into bodies of water. Various human development sources are also major factors, including runoff and leaching from residential, municipal, and industrial waste disposal system, and runoff from mines, oil fields, industrial sites, and construction sites.
Although eutrophication is a natural process, it generally takes a long time for a lake to become eutrophic, and it is seen as a type of aging process of the body of water. A lake with a lot of nutrients is generally not a very desirable body of water—the algal blooms can result in fish kills, invasive rooted plants can help to choke the lake, and even toxins are produced that can be fatal to livestock and even children.
As stewards of creation, humans have a responsibility to care for nature. There are many ways in which more responsible activities of people can reduce any impact on eutrophication. This article details some of the measures. For example, the amount of fertilizer used by farmers is often in excess of what is actually needed by the plants.