Unable to stick with the hardback edition years ago, I recently decided to give it another try in audio form. Incredibly dry and often tedious, it reads more like a textbook than general non-fiction. Even so, I found his telling of the unfolding of the development of human civilizations on each continent fascinating. Perhaps in attempting to debunk the Great Man theory of history he arrives at sort of an environmental fatalism that leaves little room for other explanations.
If nothing else the author uncovered a curiosity in me for pre-Columbian cultures.