Hydro power is definitely a favorite of mine. Not only is it very very efficient, It created an outstanding amount of power with little to no pollution. Only down side is of course loosing the upstream landscape. But if places in the right spot, It can be very very useful.,(reply>), +Jarynn Indeed the Banquo Dam proved just how unimaginably destructive mismanagement of a dam can be rivalling atomic weapons in the scale of the death toll some 230,000 people were lost as a result. No other manmade disaster has even managed to come close to that including the intentional deployment of atomic weapons, though admittedly modern devices could certainly rival that level of destruction if one were ever used they are pretty much the only technology we have today which could top that though which just really puts the scale of the damage in perspective.,(reply>), It also destroys a river's ecosystem. It slows and alters the current and cuts off parts of the environment from the rest. Dams also have terrifying consequences if they fail.