Climate negotiators are working to finalize the technical aspects of a climate change deal, and they must form the legal structure of the deal as part of that, Responding to Climate Change's Megan Darby reports: "The ultimate goal is a deal this December setting out how countries will cooperate to decarbonise their economies, prepare for the impacts of climate change and support the developing world in both endeavours." Interim talks are being held in Bonn this week.