Earlier quoted context omitted.
In the absence of fresh water, it becomes a matter of the energy required to clean / desalinate / or distill contaminated water. Abundant clean renewable energy would solve "rare" water issues.
So would magic. We need to rid ourselves of the mythical notion of "abundant", meaning arbitrarily cheap, energy. There are only a few more doublings of global energy usage left before we heat the atmosphere significantly, not due to greenhouse gases, but by raising the equilibrium temperature of Earth as a radiating blackbody in space. TANSTAAFL. Every resource is ultimately finite. Let's live within our limits rath…
Recently Germany had reached a day with %50 of electricity produced by Solar. [2]
[1] http://www.bloomberg.com/news/articles/2014-10-29/while-you-...
[2] http://theweek.com/speedreads/451299/germany-gets-50-percent...