In 2011, the U.N. announced that the world population had reached 7 billion. This year’s new projections for future population growth are higher than previously expected. Projects like Millennium Cities hope to alleviate many of the pressures that crowded cities place on infrastructure, public services, and the environment.

via State of the Planet http://blogs.ei.columbia.edu/2013/07/15/world-population-projected-to-cross-11-billion-threshold-in-2100/