"Green" Automobiles | The Kojo Nnamdi Show

American automakers say they're going green, with GM and Ford announcing plans to ratchet up investment in electric cars, hydrogen fuel cells, and other technology. Analysts say it's a matter of survival, but skeptics question whether a large number of consumers will buy into the idea. Tech Tuesday explores competing visions of an environmentally-friendly auto industry, and whether the era of the gas-guzzler is at an end.