Where did our planet come from? Why is it here (with us, conscious intelligent beings, on it)? Where and how is it going to end? These interesting questions (I've massaged them a bit) are discussed in John Gribbin's Alone in the Universe: Why Our Planet Is Unique (John Wiley and Sons, 2011). Other authors have discussed the same general topic, but Gribben does the best job I've seen of reviewing the many ways in which Earth seems so terribly well positioned to favor the origin and development of life.
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