The Rocinha slum in Rio de Janeiro, long a serious problem, shows one of the dangers of overpopulation - although many Rio slums have improved since 2011. Now half the world, including Brazil, is below the 2.1 fertility rate needed for zero growth. Photo: Felipe Dana, Associated Press The Rocinha slum in Rio de Janeiro, long a serious problem, shows...
http://www.sfgate.com/science/article/Population-growth-increases-climate-fear-4781833.php#page-1