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he was cognizant of the economic realities of urban life and recognized his own privileged, financially independent position.[341] In 1962, Krutch expressed his partial solution for the dilemma facing Tucsonans seeking to maintain both a naturally healthful community and a vibrant and economically expanding city: Does all this mean that the desert, with all it has meant to many of us and might mean to generations still to come, is doomed to disappear in the not too distant futureunless indeed a fundamental change of heart should take place in the majority of the citizens who direct our destinies

PubMed PMID: 3948463 Karapiperi K, Gousis C and Papaioannidou P (2010)

These typically settle within a day or two

Zhang, Y., Hodgson, N