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ease from Vermont to Miami has nothing to say about the consequences of Vermont acquiring Miami's climate.

"Reasoning from the experience of past adaptations is risky given that in the past societies could usually expect that climate fifty years hence would be reasonably like that of the present. This will probably not be the case during a greenhouse warming, because of the difficulties of forecasting regional impacts, the rate of expected change, and because we may be operating under conditions with which mankind has no past experience.

"Finally, it may be strictly accurate that 'pluses and minuses' will combine to produce 'small net change for a nation of our size.' But the distribution of impacts in time and space matters more than this treatment suggests. Costs that are indisputably enormous (including human suffering) begin to appear deceptively manageable when viewed solely from the perspective of their impacts on a multitrillion dollar economy. For example, in the case of cities, the study finds that while 'adaptation might be costly, the costs would in most cases be lower than the cost of moving the city.'"

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