Water: A Natural History

A generation after the Clean Water Act was passed, one third of our waters are still polluted, according to the author, and only 6% of contamination is caused by industry. Environmental engineer Outwater, who managed scum and sludge removal in the Boston Harbor cleanup, reaches back into our history to chart the changes in our waters. Once, a tenth of the total land area was beaver-built wetland; the beaver's decline caused the first major shift in the nation's water cycle. The depressions buffalo made on the ground and the holes dug by prairie dogs collected rain and runoff that seeped down to the water table; our waterways have been transformed by the loss of these keystone species. Outwater looks at grasslands and forests, artificial waterways, agriculture, aqueducts and toilet bowls, sewers and sludge (she gives a guided tour of a waste-treatment plant). She makes a strong case for restoring natural systems to public lands--repopulating beaver, bison and prairie dogs. This book is a valuable addition to environmental literature and to our understanding of water. (Oct.)