IBO tea tfo KO 100 so to to ga o no 4C 60 fo ioo~ mo 240 



60' 



FIG. 36. The distribution of human energy on the basis of climate. 

 From "Civilization and Climate." 



jso iso no 1*0 '100 so 60 10 sia 



za -to 60 so 100 no 1*0 reo '80 





FIG. 37. The distribution of civilization. From "Civilization and Climate. " 



