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Passionate, succinct, chilling, closely argued, sometimes hilarious, touchingly well-intentioned, and essential. --Margaret Atwood, The New York Review of Books

Nearly fifteen years ago, in The End of Nature, Bill McKibben demonstrated that humanity had begun to irrevocably alter and endanger our environment on a global scale. Now he turns his eye to an array of technologies that could change our relationship not with the rest of nature but with ourselves. He explores the frontiers of genetic engineering, robotics, and nanotechnology--all of which we are approaching with astonishing speed--and shows that each threatens to take us past a point of no return. We now stand, in Michael Pollan's words, on a moral and existential threshold, poised between the human past and a post-human future. McKibben offers a celebration of what it means to be human, and a warning that we risk the loss of all meaning if we step across the threshold. Instantly acclaimed for its passion and insight, this wise and eloquent book argues that we cannot forever grow in reach and power--that we must at last learn how to say, Enough.