Something is wrong with climate theory.
We frequently forget that there is more to science than the making of a more precise measurement or a more elaborate calculation.  It is even more than applying to new problems the methods that worked on old problems.  These activities, which keep most of us busy most of the time, are important, but the new and unexpected discoveries are more important.  And many radically new discoveries arise from scientific puzzles, the "anomalies."  We believe that studies of past climates have exposed an anomaly that deserves attention and that may result in a fundamentally new understanding of the climate system.  The poles have been much warmer throughout much of Earth's history than they are now.  Ice-age episodes with durations of millions of years have been separated by periods of hundreds of millions of years that have left little or no evidence of polar ice sheets.  The data are best for the most recent of these ice-free episodes so we will concentrate on the Eocene.
Walker
J C
JC
Department of Geological Sciences, University of Michigan, Ann Arbor 48109, USA.
Sloan
L C
LC
D001272:Atmosphere; D002980:Climate; D018534:Earth, Planet; D006358:Hot Temperature; D007053:Ice; D008962:Models, Theoretical; D009792:Oceans and Seas; D010163:Paleontology; D012993:Solar Energy
D007053:Ice