A few years ago during my studies we watched an interesting documentary called Water Wars. They talk about the future state of fresh water, how the Bush family has been buying up land that occupy aquifers, and what is currently being done to help prepare for all of this. It was a very interesting movie, incredibly bias, but you can always take something good away from documentaries like that.
In the film, they indicated that the reason the Bush family bought up all of this land in Paraguay was because under neath it was one of the largest aquifers in the world. At the time, nobody could seem to figure it out and everyone looked at it from a political stand point.
http://en.wikipedia.org/wiki/Guaran%C3%AD_Aquifer
I am in no way saying I agree with the video or anything of that nature, but I am saying it was an interesting watch and all Canadian done which was even cooler.