<Li> Imbalance in sediment load and nutrient filtration </Li> <P> Concerns are developing over certain aspects of farm fishing, which uses natural waterways to harvest fish for human consumption and pharmaceuticals . This practice has become especially popular in Asia and the South Pacific . Its impact upon much larger waterways downstream has negatively affected many small island developing states . </P> <P> The function of natural wetlands can be classified by their ecosystem benefits . United Nations Millennium Ecosystem Assessment and Ramsar Convention found wetlands to be of biosphere significance and societal importance in the following areas: </P> <Ul> <Li> Flood control </Li> <Li> Groundwater replenishment </Li> <Li> Shoreline stabilisation and storm protection </Li> <Li> Water purification </Li> <Li> Reservoirs of biodiversity </Li> <Li> Wetland products </Li> <Li> Cultural values </Li> <Li> Recreation and tourism </Li> <Li> Climate change mitigation and adaptation </Li> </Ul>

Which natural resource is known as the kidneys of the environment