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Sir Richard Branson believes that business leaders have a responsibility to try to solve some of the world's biggest problems. (06:33)
Herman Cain is joking about the deadly, electrified U.S.-Mexico border fence -- unless Americans are into the idea, in which case he means it. (05:12)
In the face of all the mounting evidence for climate change, America has stood with one voice and boldly proclaimed, "Eh." (04:04)
Europe might be on the road to financial ruin, protestors try to shut down Wall Street, and Daniel Yergin discusses his book on the future of energy. (00:31)
Author Daniel Yergin discusses hydrofracking, alternative energy sources and America's decreasing demand for oil. (05:54)
Grassroots-organic-slow-food-locavore types who buy electric cars love manufactured traditions. (04:24)
Stephen considers the various options for alternative energy, particularly those based on animal treadmills and chicken sh*t. (04:00)
Tom Ridge believes natural gas is a matter of economic and national security. (06:21)
Robert F. Kennedy, Jr. says mountaintop mining is not a good thing for American democracy. (06:26)
In this unedited, extended interview, Austan Goolsbee wants to cut spending and raise high-income taxes. (05:37)
Laurie Garrett explains how biofuels, natural disasters and disease contribute to the global food crisis. (03:43)
Evan Osnos believes America needs to be working as hard as China if it wants to come up with the next big technological idea. (06:56)
Joe Barton is an expert on the wind industry, and John Shimkus knows that God will not destroy the Earth. (05:14)
Tom Perriello is campaigning on the Democrats' record because he thinks Americans are smart enough to understand that results take time. (07:07)
Frito-Lay discontinues its biodegradable chip bags, and residents file lawsuits about the noise caused by wind turbines. (03:32)
In order to solve global warming, Saul Griffith says we have to change our behaviors, not just our technologies. (05:57)
Obama unites the country with his speech addressing the BP oil spill, and Stephen finds an alternative energy source in Devo's belongings. (04:33)
Stewart Brand accepts the use of nuclear power because he wants to see us get off all the fossil fuels. (05:25)
Stephen fears for a dangerous new wind farm and doesn't understand all the fuss being made over a little oil in the ocean. (03:00)
Shai Agassi explains his electric car network that's modeled after cell phone plans. (04:58)