Water
The big, big problem that no one wants to talk about.
The article is being slightly facetious about the changes in food habits making an impact on saving water, but the focus is still sound. Just as the food riots in Sierra Leone and Haiti happened in 2008 and still continued in 2009, so will massive riots happen in the western US, the Middle East and China (well, hell, everywhere for that matter).
But... hey.. as a proud American waste all that f**king Dasani. Who needs it anyway? 😉