While American policy, industry and public trends increasingly coalesce around ''green'' ethics, New York Times Freakonomics blog's contributor James McWilliams wonders whether those resource conservation and energy efficiency efforts matter much, given long-shaped ''external realities'' and sprawl habits. ''After all,'' he writes, ''step beyond the privileged confines of our ever-greening abodes, and you'll discover that most American cities are, by design, ecological train wrecks.''
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