I made this post just over a year ago pertaining to the potential (likely?) global water crisis.
Here's an article addressing this issue and how GE has been investing in the infrastructure to deal with this problem.
Here's another article discussing the topic of "Peak Water." Interesting stuff.
Currently PHO (PowerShares Water Resource ETF) is approaching resistance (around $22.50) at it's 52-week high and up 22% since this time last year.