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Chapin FS, McGuire AD, Nuttall M, Virginia R, Young O, Zimov SA, Berman M, Callaghan TV, Convey P, Crepin A-S. Chapter 25: Polar Systems. In: Ash N Ecosystems and Human Well-being: Current State and Trends. Vol. 1. Ecosystems and Human Well-being: Current State and Trends. Washington; 2005. p. 717-743.\par \par }