Quite a lot of late the word eutrophication (Greek: eutrophia - healthy,adequate nutrition, development; German: Eutrophie) or more precisely hypertrophication, is the ecosystem response to the addition of artificial or natural substances, such as nitrates and phosphates being dumped in our rivers, through fertilizers,cleaning chemicals or sewage, to an aquatic system. One example is the "bloom" or great increase of phytoplankton (weeds) in a water body as a response to increased levels of nutrients. The negative environmental effects include hypoxia, the depletion of oxygen in the water, which basically kills our fish and other animal populations.