Passionate, succinct, chilling, closely argued, sometimes hilarious, touchingly well-intentioned, and essential." Margaret Atwood,The New York Review of Books Nearly fifteen years ago, inThe 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 nanotechnologyall of which we are approaching with astonishing speedand 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 powerthat we must at last learn how to say, "Enough." Bill McKibbenis the author of a dozen books, includingThe End of Nature,Enough: Staying Human in an Engineered Age, andDeep Economy. A former staff writer forThe New Yorker, he writes regularly forHarper's,The Atlantic Monthly, andThe New York Review of Books, among other publications. He is a scholar in residence at Middlebury College and lives in Vermont with his wife, the writer Sue Halpern, and their daughter. From the author ofThe End of Naturecomes a passionate plea to limit the technologies that could change the very definition of who we are. We are on the verge of crossing a linefrom born to made, from created to built. Sometime in the next few years, a scientist will reprogram a human egg or sperm cell, spawning a genetic change that could be passed down into eternity. We are sleepwalking toward the future, argues Bill McKibben, and it's time to open our eyes. InThe End of Nature, published nearly fifteen years ago, McKibben demonstrated that humanity had begun to alter irrevocablyand endangerour environment on a global scale. Now he turns his eye to a new and equally urgent issue: the dangers inherent in an array of technologies that threaten not just our survival, but our identity. Imagine a future where lab workers can reprogram human embryos to make our children "smarter" or "more sociable" or "happier." Some researchers are doing more than imagining this future: having worked with such changes on a wide range of other animals, they've begun to plan for what they see as the inevitable transformation of our species. They are joined by other engineers, working in fields like advanced robotics and nanotechnology, who foresee a not-very-distant day when people merge with machines to create a "posthuman" world. Enoughexamines such possibilities, and explains how we can avoid their worst consequences while still enjoying the fruits of our new scientific understandings. More, it confronts the most basic questions that our technological society faces: Will we ever decide that we've grown powerful enough? Can we draw a line and say this far and no further? McKibben answers yes, and argues that only by staying human can we find true meaning in our lives. A warning against the gravest dangers human beings have ever faced, this wise and eloquent book is also a passionate defense of the world we were born into, and a celebration of our ability to say, "Enough." "In this wise, well-researched, and important book, Bill McKibben addresses the burning philosophical question of the new century, and

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