Climate Policy after 2012

Discussion over post-2012 climate policy is now entering a crucial phase. Despite the potential great risks of prolonged global warming, the success of an international climate stabilization agreement hinges to a great extent on its economic feasibility. This article makes precise the assumptions that underpin current mainstream estimates of the costs of controlling climate change and provides quantitative estimates of cost differentials under different scenarios. In particular, the article analyses the role of three utmost factors in the economic cost of a climate treaty: energy technology development; the participation rate of developing countries; and the timing of global action. We show that all three factors have a major impact on policy macroeconomic costs. Addressing them effectively is therefore indispensable in ensuring the feasibility of any international agreement to control global warming. Therefore, we propose a series of policy recommendations that can help addressing the issues of technology, timing and participation, and that represent key policy implications for a post-2012 climate policy. (JEL codes: C72, H23, Q25, Q28)