"It's so easy to demagogue the issue and make someone who speaks out against the internal-combustion engine sound like an insane communist, when the truth is that the internal-combustion engine is the biggest threat to my life in the next 25 years, in terms of what it's doing to our environment and how it's depleting the ozone layer and so forth."

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Of all the unexpected qualities of an unexpected universe, the sheer organizing power of animal and plant metabolism is one of the most remarkable. . . . Where it reaches its highest development, in the human mind, we forget it completely. . . . So important does nature regard this unseen combustion . . . that a starving man's brain will be protected to the last while his body is steadily consumed.

— Loren Eiseley