04:39
Rise and Fall: Population, Urbanization and the Environment
Much of the change that has occurred in many cities over the past century has come about as a result of the interplay among three factors: population shifts, the environment, and urbanization.
11:10
Air: China's Impact on Global Air Quality
China is in a period of rapid economic development. Its size, both in land mass and human population, and the fact that it uses primarily coal to fuel its industrialization, make for a current air pollution problem and the potential for enormous glo...