There are a substantial number of issues that negotiators will eventually need to address, and likewise, there are a set of questions that researchers (including within the Harvard Project on Climate Agreements) can begin to address now.
The Obama Administration's proposed regulation of existing power-sector sources of CO2 has the potential to be cost-effective, and if you accept these numbers, it can also be welfare-enhancing, if not welfare-maximizing.
Several of the CLAs present with me in Berlin commented that given the nature and outcome of the week, the resulting document should probably be called the 'summary by policymakers,' rather than the 'summary for policymakers.'
I had thought that arguments about massive "free lunches" in the energy efficiency and climate domain had long since been laid to rest. The debates in California (and some of the rhetoric in Washington) prove otherwise.