complexity and change. They argue that if we are to have any prospect of managing that complexity, we will need to escape the shackles of current assumptions about rationality, progress, and certainty, even as we maintain a commitment to fundamental human values.Humans have been co-evolving with their technologies since the dawn of prehistory. What is different now is that we have moved beyond external technological interventions to transform ourselves from the inside out -- even as we also remake the Earth system itself. Coping with this new reality, say Allenby and Sarewitz, means liberating ourselves from such categories as "human," "technological," and "natural" to embrace a new techno-human relationship.

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