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By Gilbert M. Gaul
By Janet Marinelli
By Fred Pearce
By Richard Schiffman
By Judith Lewis Mernit
By Carolyn Beans
By Bill McKibben
By Nicola Jones
By Jim Robbins / Photography by Ted Wood
By Jill Langlois
By Vaclav Smil
By Jacques Leslie
By Jonathan Mingle
By Beth Gardiner
By Gabriel Popkin
By Jon Hurdle