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Nanotechnology is the coming new idea. Some green campaigners know that, like genetic modification, it must be bad – though they haven’t quite figured out exactly why, yet. Mark and Daniel Ratner in Nanotechnology (Prentice Hall, $24.99) provide a clear guide to its building blocks and, in four pages at the end, offer what the greens have been searching for – an equally clear critique of what could go wrong. Let the nanowars commence.