"If we were driving pure hydrogen automobiles, that automobile would actually help clean up the air because the air coming out of the exhaust would be cleaner than the air going into the engine intake."

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We had to build a city not for businesses or automobiles, but for children and thus for people. Instead of building highways, we restricted car use. We invested in high-quality sidewalks, pedestrian streets, parks, bicycle paths, libraries; we got rid of thousands of cluttering commercial signs and planted trees. All our everyday efforts have one objective: Happiness.

— Enrique Penalosa