%0 Book Section %B Millennium Ecosystem Assessment. Current State and Trends: Findings of the Condition and Trends Working Group %D 2005 %T Polar Systems %A F. S. Chapin %A McGuire, A %A Nuttall, M %A Ross A. Virginia %A Young, O %A Zimov, S %A Christensen, T %A Godduhn, A %A Murphy, E %A Diana H. Wall %A Zockler, C %A Berman, M %A Callaghan, T %A Peter Convey %A A. S. Crepin %A Danell, K %A Hugh W. Ducklow %A Forbes, B %A Kofinas, G %E R. Hassan %E R. Scholes %E N. Ash %B Millennium Ecosystem Assessment. Current State and Trends: Findings of the Condition and Trends Working Group %I Island Press %P 717-743 %G eng %R LTER