By Shane Doyle
By Peter Roberts
By Michael Mayerfeld Bell
By Michael Mason
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By R. J. Scholes (University of the Witwatersrand, Johannesburg), B. H. Walker
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By Michael Mortimore
By John Holman, et al
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By United Nations Environment Programme
By Professor J. R. McNeill
By Fortey, Richard
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By Freya Mathews
By J. Andrews
By Cameron Dunn, Sue Warn
By Michael W Fox