You might be interested to bookmark/revisit Climateprogress.org for "iconic figures."  Here's one to start:
http://climateprogress.org/2008/08/27/must-have-ppt-1-the-narrow-temperature-window-that-gave-us-modern-human-civilization/

Dr. Stephen R. Humphrey, Director of Academic Programs,
School of Natural Resources and Environment,
Box 116455, 103 Black Hall, University of Florida
Gainesville, FL  32611-6455  USA
Tel. 352-392-9230, Fax 352-392-9748
http://snre.ufl.edu<http://snre.ufl.edu/>