> Real problem and solutions: - energy -> Need hydro or nuclear. Everything else is just marketing bullshit.

Agree in general, yet from what i've read most of the worlds hydro (read: river) resources are already being tapped extensively. Although hydro makes up a healthy chunk today, can it expand and grow along with our increasing energy demands when we've already tapped the largest rivers? I am curious if you have sources that show hydro can grow.

I recall reading this counter to hydro in a Smil book (Growth I believe) although I will have to double check which one.