Environmental economics angles (SuperFreakonomics):
My favorite part of the book was the presentation of the List-Levitt critique of experimental economics. In particular the authors discuss whether the subject participants are more cooperative to begin with and also whether they are primed to please the experimenter. The biographical information on John List is fascinating.
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Geo-engineering, as a response to global warming, receives more pages than any other single topic.
The official environmental economics review is forthcoming in the next couple of years.