Already, there are serious reservations about the final IPCC summary for policymakers, which was released today. The BBC leads the charge, noting that the economic models used to recommend mitigation policies aim to hold the atmospheric carbon dioxide concentration at 550 parts per million (ppm). However, more recent scientific evidence suggests, and I agree, that our policies need to keep concentrations much closer to 450 ppm. I certainly applaud the IPCC and its work, but the reality of the process is that every month devoted to writing and editing is a month that doesn't account for the most current data. …
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Joseph Romm is the editor of Climate Progress and a senior fellow at the Center for American Progress.