The four resources that are disappearing are oil, water, fish and food.
"Consider this: since 2005, the price of wheat has more than tripled. So has the price of corn. Rice has gone up more than 500%. These price increases reflect a dwindling of global food stocks - demand for food is rising faster than our ability to produce it. The phenomenon has been dubbed the "global food crisis of 2008" - but some are beginning to refer to it as the "perpetual food crisis."
It's not just rising populations we're facing, it's a rising standard of living in developing mega-countries such as China and India. As these giant economies start to move, the national diet steps up from a grain base to start including more and more meat."