Water management would help, but it must be on a regional, not local scale. Many of our large, deeper aquifers are being drained, with damage to the environment. Shallow reservoirs, which fed dug wells in the old days, are contaminated by pesticides, petroleum leakage, and other materials. Rivers here in western Canada can be sport-fished but the fish cannot be eaten (North Saskatchewan, Bow, and others) because of mercury, farm runoff, industrial and sewage pollutants. Large population centers such as Phoenix are a disaster in the arid southwest. Mankind is smart enough to survive, but the planet will not be neither healthy nor pleasant to live in.