Comfortably divided into three major themes, Fagan opens with an explanation of El Nino's "discovery". What had seemed to be freak weather events proved to have an underlying pattern. The El Nino Southern Oscillation [ENSO] is an eastward moving body of warm Pacific Ocean water. The warmth blocks the flow of the Humboldt Current moving from Antarctica along the South American coast. Fish die or depart, with birds duplicating the pattern. Fagan stresses that the effect of that warm cell has global reach and has roots deep in time. Pharonic Egypt felt its impact, perhaps contributing, if not causing, social upheaval and even a new philosophy of rule by those absolute rulers.

How society and its rulers deal with abrupt weather change is the focus of the second part. As an anthropologist, Fagan is conversant with ancient societies. He examines the Andean Moche people who engineered extensive irrigation systems to catch feeble rainfall. With El Nino, rainfall changes from feeble to fabulous and the Moche watched their canals being flushed away. The following famines broke the power of the Moche aristocracy and the culture collapsed. A similar fate occurred to the Maya, whose rigid social pattern prevented them from coping with crop loss. However, the Anasazi people of the American Southwest, long skilled in desert agriculture, had a different method for dealing with drought. A loose, flexible society encouraged sharing of resources, then departure when the soil failed. Fagan overturns the long-held view that the Anasazi "mysteriously" disappeared. He contends they simply dispersed.

In the final section, Fagan relates some historical climate events such as The Little Ice Age and the Sahel drought. He examines the short-sighted policies that have exacerbated the human impact of such events. Over expansion in good years leaves no flexibility for addressing the needs of bad times. Governments must avoid superficial solutions in the face of knowing climate will generate surprises. Better planning scenarios are required for land occupation and use. Although it's been said before, Fagan urges better understanding of what is sustainable. That, of course, means more research and the application of political will derived from its results. While that may curtail some short-term profit gains and force revision of some cultural noms, it's the survival of the species that's at stake.

Fagan's easy writing style mustn't undercut the value of this book. Enhanced with good maps tied nicely to the text and an outstanding bibliography make this book required reading. Weather, after all, is part of the human condition everywhere. We all need to understand better its impact, and cheap jokes about El Nino aren't part of that comprehension. [stephen a. haines - Ottawa, Canada]

I think this subject was too broad for Fagan. He has done a much better job on a smaller one in "The Little Ice Age".

Meteorologists and Climatologists will enjoy this book, with simple and historical treatments of Monsoons, ENSO, and the North Atlantic Oscillation. Those with a weather interest will enjoy this book, especially the first 100 page or so.

Finally, the book connects the climatological phenomena with civilizations. The climate impacted all civilizations and may have weakened them, contributing the their evolution or demise. These concepts are supported in the text and fit well with the concept on human evolution in Ian Tattersall's book "Becoming Human-Evolution and human uniqueness".

This book supplements some of the ice age material in the earlier Fagan book, "The Great Journey-The peopling of ancient America". This book is both easy to read and understand, well worth the cost.