Just another GR refugee. Other than that, I had a stroke in 2004, and read almost anything I can get my hands on, though I have a particular weakness for history, mystery, and historical fiction.
This is an interesting survey of the impact of climate change on man in the last 18,000 or so years (since the last ice age).
Fagan knows his material, as he is a distinguished anthropologist. However, in reading the material on effects of climate change in the historical era, I think he sometimes simplifies the chain of historical cause-and-effect - probably because he only had so much space.
Or perhaps I see this because my training is as a historian, rather than in anthropology. Causation in specific historical events is usually not quite that simple.
Excellent maps, timelines, and other illustrations throughout.