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Walker B, Barrett S, Polasky S, Galaz V, Folke C, Engström G, Ackerman F, Arrow K, Carpenter S, Chopra K, Daily G, Ehrlich P, Hughes T, Kautsky N, Levin S, Mäler K-G, Shogren J, Vincent J, Xepapadeas T, de Zeeuw A. Environment. Looming global-scale failures and missing institutions. Science (New York, NY). 2009 Sep;325(5946):1345–1346.