It’s hard to think about the planet when you’re hurtling across it at 150 mph. Yet recent auto shows from Geneva to New York have unveiled concept sports cars that pursue power in hybrid, hydrogen, ethanol or diesel form.

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Forget about primitive wooden contraptions driven by towheaded tykes down a homemade ramp in Your Hometown, U.S.A. The new—make that the extreme—take on the quaint old soapbox derby features sleek, futuristic projectiles riding on chassis meant to accommodate speeds of 50, 60, even 70 miles an hour.

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