Is Climate Change the Source of Human Crisis?April 2nd, 2012
From the linked article: “[Researchers] noted that social disturbance, societal collapse and population collapse often coincided with significant climate change in America, the Middle East, China, and many other countries in preindustrial times, suggesting that climate change was the ultimate cause of human crisis in many preindustrial societies.” The article goes on to link climate change with famine, war, economic chaos, and mass emigration. It then suggests that climate change, not sociopolitical factors, was the real motivating force behind these events.
On a side note, some time ago I read the book Collapse, which analyzes the collapse of four societies. In each case the author found climate change to be one of the factors, and in several cases it was the primary factor.