Along the shores of Lake Ontario, over 90 percent of wetlands in the area have been sacrificed to other land use needs. In the lower Mississippi valley, the floodplain forested wetlands, which once covered 39,000 square miles, now cover only 7,000 (the rest of the area was cleared to provide land for agriculture). For centuries, these marshes, floodplains, lagoons, deltas, and other wetland systems of the world have been perceived as wasteland, obstacles...