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Woe is us! Our overpopulated and overheated world is running out of water, food, and nonrenewable resources, all the while menaced by natural and bioterror pandemics. As The Limits to Growth famously predicted 40 years ago, exponential growth in population, resource depletion, and pollution are leading inexorably to civilizational collapse. Most readers will be familiar with this conventional lament of impending doom.