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"Marq de Villiers is an expert guide to the vast and contentious terrain of water management, and in Back to the Well he steers skilfully past ideological excess and careless hyperbole to provide a clear and thorough account of the state of the planet"s water today. This is a provocative and engagingly written book that strikes a welcome balance between hard-eyed truth and buoyant optimism." — Chris Turner, author of The Leap and The War on Science