[youtube]http://www.youtube.com/watch?v=sc4HxPxNrZ0&feature=player_embedded[/youtube]
Sometime this year, the world’s population will pass the 7 billion mark. By 2045, that figure is expected to be 9 billion. National Geographic is beginning a year-long series on how the world’s population came to be, where we are headed, and the challenges that come with so many of us living together. Those challenges include energy consumption, education, birth control, natural resources, immigration, and more.
