content: While a potentially interesting topic, the authors bored me. The consistantly repeat themselves. I don't know how many times I was told we know the furture because our authors have studied the past! The science was burdened with pseudo-short stories of past and future Earths which often turned out to be directly related to our authors. I felt the actual scientific content here presented could have been presented in a quarter of the pages much more clearly. After reading it in two nights I am left with a feeling of a mind numbed through repeated mental bludgeoning.