reasonableness, seriousness, splitting the difference, and generally not getting overly excited about anything. This is the habit of thought that truly rules our era, far more among the liberals who concern themselves with matters of climate policy than among conservatives, many of whom simply deny the existence of the crisis. Climate change presents a profound challenge to this cautious centrism because half measures won’t cut it: “all of the above energy” programs, as U.S. President Barack Obama describes his approach, has about as much chance of success as an all of the above diet, and the
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