Finally, near the end is a discussion of the data on global warming. The author really hedges his bets here and is brutally honest about what is known and what is not known. I think a little more exposition on the philosophy of science would have been helpful here (i.e. "How do we know what we know? Why are we more confident about some things than others? At what level of consensus among scientists do we decide a theory is true?"), but that could take another book. I think the bottom line here is that we really don't know yet just how much of an effect (if any) we can have on the Earth's overall atmosphere and the greenhouse effect. Anyone who claims otherwise is simply not being honest. However, to wait until the answer to this question is indisputable before acting to ensure our future would be foolish.
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