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The developers of future transport are focusing on cars that run on cleaner fuels as the quest for an environmentally friendly automobile continues. America's love affair with the car shows no signs of abatement. Engineers and other researchers are well aware of the affect of so many vehicles on air quality, which directly impacts the health and well-being of citizens. Ultrascience 2: Cars of the Future explores the possible solutions to the growing problem, looking at electric cars, and experiments with hydrogen and other potential fuels to replace gasoline.