Something serious from Mark Newman's home page

On a more sober note, here's my Thought for the Day (well, the century really). This is a graph of the population of the world from the year zero onwards. The data are from a variety of sources. The line is a fit to the equation dn/dt = Cn^2 which gives us an estimate of how the population will continue to grow. (Contrary to popular belief, the population of the world is not growing exponentially. It's growing a great deal faster than exponentially.)

Our ability to feed everyone using our current farming techniques under ideal conditions will end around 2020.