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HITTING THE ROAD

Projections suggest that by 2050 there will be two billion vehicles on the world's roads, two and a half times as many as there are today. The "Car Talk" duo, brothers Tom and Ray Magliozzi, hit the road in search of the car of the future.
running time 8:16

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HYDROGEN FUEL CELLS

Iceland, with a thousand times fewer people and cars than the U.S., has introduced the world's first hydrogen-fueled public buses in an effort to curb dependence on imported oil.
running time 6:40

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TOWARDS BIOFUELS

Tom and Ray look at possible new ways to make ethanol. Such "biofuels" have much lower greenhouse-gas emissions but, critics say, come at a cost.
running time 6:34

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FRONTIERS OF EFFICIENCY

Engines have become more fuel-efficient over the years, but that efficiency has been channeled into more powerful vehicles rather than improving fuel economy.
running time 11:13

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PLUGGING IN

Can the next generation of hybrid cars cause an energy revolution by allowing us to plug into the grid? Vehicles powered from power plants could substantially reduce greenhouse-gas emissions.
running time 10:22

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TAKING ACTION

To make the switch to more Earth-friendly vehicles, we need more than visionary thinkers and eco-conscious consumers, experts say. We need concerted government action.
running time 7:07