Homo sapiens has become the most dominant species on Earth. Unfortunately, our impact is devastating, and if we continue to destroy the environment as we do today, half the world's species will become extinct early in the next [twenty-first] century Homo sapiens is poised to become the greatest catastrophic agent since a giant asteroid collided with the Earth sixty-five million years ago, wiping out half the world's species in a geological instant. (Richard Leakey and Roger Levin, The Sixth Extinction)1

And they were sawing off the branches on which they were sitting, while shouting across their experiences to one another how to saw more efficiently. And they went crashing down into the deep. And those who watched them shook their heads and continued sawing vigorously. (Bertolt Brecht, Exile III)2

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Guide to Alternative Fuels

Guide to Alternative Fuels

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