Turning Gas Guzzlers Into Clean Machines in Mexico City

In Mexico City, more than 3.5 million cars navigate the streets, plazas and avenues of North America's most populous urban area. That makes for a ton of exhaust, but luckily, there's a solution to this environmental problem. Enter engineer/auto mechanic Alvaro de la Paz and computer scientist Hector Ruiz. Together, they're transforming old gasoline-fueled automobiles into electric cars. Over the past decade, the pair has converted more than two dozen vehicles into zero-emissions automobiles. While that may seem like a small dent in an enormous cloud of exhaust, the pair hopes that their project will inspire younger generations to work for a brighter, cleaner future.