Sources

http://www.conserve-energy-future.com/causes-effects-solutions-of-overpopulation.php

http://en.wikipedia.org/wiki/List_of_countries_by_life_expectancy

http://en.wikipedia.org/wiki/List_of_sovereign_states_and_dependent_territories_by_birth

http://answers.yahoo.com/question/index?qid=20110105192012AAYwVC9