"And no matter how serious an environmental problem the automobile poses in today's big city, the horse was dirtier, smelled worse, killed and maimed more people, and congested the streets just as much."

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Growth, growth, growth -- that's all we've known . . . World automobile production is doubling every 10 years; human population growth is like nothing that has happened in all of geologic history. The world will only tolerate so many doublings of anything -- whether it's power plants or grasshoppers.

— M. King Hubbert