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note
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Many of the ideas incorporated here were generated within the ACSOE programme funded by the U.K. National Environmental Research Council and the JONUS programme funded by the U.K. Ministry of Agriculture Fisheries and Food; the Ministry of Transport, Environment and the Regions; and the Environment Agency. The views expressed are mine and do not reflect the policy of the funding departments. I acknowledge useful discussions with all my colleagues in these projects, particularly S. Malcolm, R. Sanders, and L. Spokes. I also acknowledge the fine work of the many researchers whose papers I have drawn on for this review and the helpful comments of the referees.
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