By David Suzuki with Amanda McConnell
By Mandelbrot, Benoit B.
By Robert B. Gibson, Selma Hassan, Susan Holtz
By Sharp, Robin
By Un-Habitat
By Walker, J., Dinedn, Jacquelyn
By Niki Walker
By Hyde, Paul, Reeve
By Alberts, Bruce
By Dashner, James
By Rostron, Jack
By J. F. Knott, D. Elliott
By Brown, Frances, Hall, Derek
By Ackers, P., White, W. R., Perkins, J. A., Harrison, A. J. M.
By Clough, Ray
By Fiennes, Ranulp, Ranulph
By Shashi Shekhar, Pamela Vold
By Pendergrast, Mark
By Musgrave, Toby
By McCormick, John
By Delreux, Tom, Happaerts, Sander
By DK, Packham, Chris, Smithsonian Institution
By Angelaki, Vicky
By Warren, Kenneth
By Bedient, Phillip B., Huber, Wayne C.
By Sarah Blaffer Hrdy
By Kirk Johnson, Ian Miller
By Various
By Lindon, Mathieu