This research was supported by FAPESP (Grant 00/04673-0 and 01/10969-6), by CNPq (Proc. 522456/95-2), and by the Inter-American Institute for Global Change Research (IAI) Project SACC/CRN-061. We thank Pedro L. Silva Dias for the stimulating discussions and for his contribution to the initiation of this project. We also thank two anonymous reviewers for their critical and stimulating remarks.
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