Climates of hunger : mankind and the world's changing weather / Reid A. Bryson and Thomas J. Murray.

Climate has always had profound effects upon human history, helping both to build and to destroy great civilizations. Until now, we have not had the knowledge to react intelligently to the signs of shifting climate. Today, even though we remain essentially powerless to affect climate purposefully, we are ready to recognize the signs of change and we are somewhat better able to predict the effects of those changes.