This Blacktop Comes With Whitewalls

AIR POLLUTION ISN'T THE ONLY EVIL CARS LEAVE BEHIND. Every year, the U.S. scraps 275 million tires. Dumps already contain about 3 billion rubber carcasses--enough to circle the earth 34 times, according to researchers at North Carolina State University. Tires don't biodegrade. Burning them releases noxious fumes and liquids. And their shape makes them practically useless for any secondary purpose.

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