Dirty little secret: ALL "green/clean" power has a negative impact on the local environment. With care you can shave percentages off instead of commandeering th

Dirty little secret: ALL "green/clean" power has a negative impact on the local environment. With care you can shave percentages off instead of commandeering the energy source totally to the detriment of the micro-ecosystem relying on it, but don't fall for the attractive implication that there is no environmental impact on natural ecosystems. Seems he minimized the impact on fish by redirecting just a fraction of the stream, about as low-impact as any power source could be.