In other words, over the past two decades a megacity has been added every two years. Fifteen of 21 megacities are located in developing countries. Most losses were in Latin America and Africa, while there was some recovery in North America, Europe and parts of Asia. Biodiversity in the tropics is declining most dramatically, which is seen to be associated with high depletion rates of primary forests and transformation of forest into agriculture land and pasture (WWF 2010).