According to CIA estimates, the world population is expected to reach 9.2 billion by 2050. What does this mean for the planet and the welfare of its people?
As we see in China's 4-2-1 problem, family relationships will change dramatically. Other countries may follow Thailand's "Mr. Condom's" lead in encouraging birth control. The developing world may be forced to listen to Jane Goodall's advice for balance in population growth.
In the following clips, teachers, scientists, and environmentalists debate the burden -- or the blessing -- of six billion human beings.