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Kunzig, R. 2011. “Population 7 Billion: How Your World Will Change.” National Geographic, January 2011: 33 -69

Markham, Vicky. 2011. “By The Numbers: Population, Consumption, and Reproductive Health.” RH Reality Check. http://www.rhrealitycheck.org/blog/2011/08/16/numbers-population-consumption-reproductive-health; Accessed 18 August 2011.

National Geographic. 2011. “Video: 7 Billion.” National Geographic. http://video.nationalgeographic.com/video/player/specials/sitewide-redesign/ngm-7billion.html; Accessed 18 August 2011.

Population Action International. 2011. “7 Billion and Counting: What Population Growth Means for People and the Planet.” PAI. http://www.populationaction.org/Publications/Policy_and_Issue_Brief /7_Billion_and_Counting/7bn2011.pdf; Accessed 18 August 2011.

Population Action International. ND. “Why Family Planning and Reproductive Health are Critical to the Well-Being of Youth.” PAI. http://www.populationaction.org/Publications/Policy_and_Issue_Brief/FP_RH_Are_Critical_to_Youth/youth_2009.pdf; Accessed 22 August 2011.

Population Action International and Population Justice Project.  2011. “Population and the Environment: Where We’re Headed and What We Can Do.” PAI.  http://www.populationaction.org/Publications/ Advocacy_Guide/Population_and_Environment_Where_Were_Headed_and_What_We_Can_Do/popenvguide.pdf; Accessed 18 August 2011.

Taylor, Ian.  2010. “Population Overload.” BBC Focus Magazine.  http://sciencefocus.com/feature/environment/population-overload; Accessed 18 August 2011.

United Nations Population Fund (UNFPA).  ND. “Family Planning and the Environment: Stabilizing Population Would Help Sustain the Planet.” UNFPA. http://www.unfpa.org/rh/planning/mediakit/docs/new_docs/sheet3-english.pdf; Accessed 18 August 2011.