TY - CHAP T1 - Polar Systems T2 - Millennium Ecosystem Assessment. Current State and Trends: Findings of the Condition and Trends Working Group Y1 - 2005 A1 - F. S. Chapin A1 - McGuire, A A1 - Nuttall, M A1 - Ross A. Virginia A1 - Young, O A1 - Zimov, S A1 - Christensen, T A1 - Godduhn, A A1 - Murphy, E A1 - Diana H. Wall A1 - Zockler, C A1 - Berman, M A1 - Callaghan, T A1 - Peter Convey A1 - A. S. Crepin A1 - Danell, K A1 - Hugh W. Ducklow A1 - Forbes, B A1 - Kofinas, G ED - R. Hassan ED - R. Scholes ED - N. Ash JF - Millennium Ecosystem Assessment. Current State and Trends: Findings of the Condition and Trends Working Group PB - Island Press ER -