They were a way out of the Great Depression - it was a great idea, at the time, for FDR. But imagine if we opened up all those dams and opened them back up to their (original) ecosystem. Think of the fish and wildlife that would return?
Sure, hydropower is a benefit of damming rivers. It's a clean and renewable energy. But is it significant enough to sustain?
Hear from dam-busters and pro-wildlife supporters and hear their stories yourself. DamNation is a pretty wild film.