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By Fred Pearce
By Jill Langlois
By Stefan Lovgren
By Jim Robbins
By Jocelyn C. Zuckerman
By Wil Crisp
By Thomas Graham
By Jonathan Watts
By Nicola Jones
By Vaishnavi Chandrashekhar
By Catherine Collins and Douglas Frantz
By Cheryl Katz
By Carolyn Beans
By Jim Robbins / Photography by Ted Wood
By Vaclav Smil