Assume that a glacier is melting at a constant rate of 50 meters per year and that site A is 1,000 meters closer to the ice edge than site B is. Based on this data and the principle of "space for time substitution," we can assume that the conditions seen at site A in 2011 are the same as those that seen at site B in were; 1991 were; 1915 will be; 2016 will be; 2030

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