Every second, two babies are born. By the year 2000, there will be 6 billion of us, five times as many as there were in 1900. Child death rates has fallen almost everywhere and many people want large families as their children may be their only security in old age. Overpopulation is only a problem when people have insufficient access to resources like clean water, food and housing. So no matter how good the ads for contraception, the most successful population program work at improving people's living standard and education. Overpopulation is worst than the world's ever expanding urban areas. At night, satellites pick out our major cities. As the century ends, eight out of the world's ten largest collocations will be in developing nations.