The science that makes up the following twelve chapters has been culled from interviews with dozens of experts, and from hundreds of papers published in the best academic journals over the previous decade or so. Since it is science, it is tentative, ever-evolving, and some of the predictions that follow will surely not come precisely to pass. Since the most recent IPCC report, much of that evolving work has focused on climate impacts arising from a high-emissions scenario, one producing four or five degrees of warming by the end of this century. But while those projections may well prove more
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