01:26
Air Pollution Through the 1960's
Scientist and climate change expert Michael Oppenheimer talks about the increase in air pollution in the United States and elsewhere through the 1960's. He notes that this increase was in large part responsible for legislation aimed at restricting t...
14:41
Air: Fuel Cell Technology: The Clean Air Solution?
In the area of zero emissions technology, fuel cells are very promising. When using hydrogen in a fuel cell, the only byproduct is water vapor. The technology can be used in automobiles, buses, and power plants. The main obstacle to its widespread u...