“The contradiction in our relation to nature is that the more vigorously we attempt to force its agreement with our own designs the more subject we are to its indifference, the more vulnerable to its unseeing forces. The more power we exercise over natural process the more powerless we become before it. In a matter of months we can cut down a rain forest that took tens of thousands of years to grow, but we are helpless in repulsing the desert that takes its place. And the desert, of course, is no less natural than the forest.”