So most of us have heard of the concept of Peak Oil. But have you heard concern about Peak Water?
Here's a good post that talks about this. It's definitely interesting. And for sure read the linked Wired article. As you've seen on here before, the discussion of water usage is something that I think will be a big part of our future.
The paucity or abundance of water countries and regions hold has the potential to be a leading cause of conflict as we move through this century.