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Summing up the parts: combining policy instruments for least cost climate mitigation strategies / Christina Hood. Paris : IEA, September 2011, 70 p. (information paper)http://www.iea.org/papers/2011/Summing_Up.pdfMeeting the enormous challenge of decarbonising world energy systems will require a rapid expansion of investment in clean technologies on a global scale. Mobilising these resources will be a daunting task, and it is important to undertake the transition at the lowest cost possible. This paper seeks to provide some guidance on climate change policy-making within real-world constraints, focusing on the justification of policies to supplement a carbon price, interactions between carbon pricing and supplementary policies, and management of these interactions to enable a least-cost policy response.