In many places around the world, renewable energy technologies are already cheaper than fossil fuels. In his new book, "The Great Transition," Lester Brown, renowned environmental thinker and writer, says the great energy transition may be complete much sooner than you think.
Some agriculture experts say demand for ethanol is to blame for the global crisis in food prices. They want Congress to back away from aggressive targets. But Living on Earth's Jeff Young finds little appetite for that on Capitol Hill.
Interviews with 'NY Times' correspondent Tim Weiner, filmmaker George Romero, and Lester Brown from the Earth Policy Institute.