Hydropower dams may play a role in creating and releasing methane but the greater danger has not yet been investigated or evaluated. What's that? What effect(s) does the disruption and rapid change of the larger natural system cause?

Multiple dams on the Ohio, Missouri, and Mississippi Rivers aided river transportation and controlled some annual flooding beginning in the 1930s. The result(s)? The Mississippi Delta not only stopped growing, it has begun to disappear. The natural barrier that helped to protect New Orleans from storm surges undermined - literally. Redistribution of soil along all the rivers - history and greater reliance on fertilizers and pesticides. There is now a 70 mile dead zone at the end of the Mississippi that is growing each year.

The Three Gorges Dam complex in China - its impact(s)? Flyways of migratory birds disrupted/altered. A role in the spread of Avian Flu? Who's got a bandage for my foot, I think we shot ourselves again!