For the history of modern humans, see History of the world. For the history of life on Earth, see Evolutionary history of life. The history of Earth concerns the development of the planet Earth from its formation to the present day. Nearly all branches of natural science have contributed to the understanding of the main events of the Earth's past. The age of Earth is approximately one-third of the age of the universe.
Eutrophication is one of the main problems caused by an overuse of fertilizers and an excess of manure and sewage. These wastes enter the ecosystem and generally leach away from residential, business, and agricultural sites. The first part of eutrophication is the hyper-acceleration of aquatic life growth.
Eutrophication is a natural process that typically occurs as lakes age. However, human-caused, accelerated eutrophication (called cultural eutrophication) occurs more rapidly, and causes problems in the affected water bodies, as described below.. EUTROPHICATION. Fertilizers cause problems with water quality when they runoff into rivers or percolate into groundwater. In fact, agriculture (including livestock agriculture) is the largest source of nonpoint water pollution in the US.