Washington Post: Only a few days into the UN climate summit, and it is already time to sing the Paris blues. The path to Paris was, unfortunately, paved with pessimism and imperfect accords: Rio, Kyoto, Copenhagen. In the meantime, carbon dioxide in the air has increased, raising the worlds average temperature by one degree Celsius relative to pre-industrial times.
Looking ahead, the forecast calls for overcast skies. A Paris climate deal is already framed by an impossible goal: a maximum of 2 degrees Celsius,...