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As efforts to combat global warming heat up, we examine the practicality of alternative sources of energy.
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The BBC's Roland Pease visits a working solar farm in Portugal, and goes into the lab to learn how American and European scientists are increasing the efficiency and competitiveness of commercial solar power collection and generation.
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Hydrogen fuel cells could reduce our dependence on gasoline. The BBC's Roland Pease test drives a hydrogen-powered car, and surveys the technology that many hope will make hydrogen a viable fossil-fuel alternative.
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Click here to listen to Roland Pease’s report on biofuels.
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