Built to last: designing a flexible and durable 2015 climate change agreement

The aim of this paper is to explore what a flexible and durable climate change agreement could look like and propose pragmatic options for the design of such an agreement. Building some flexibility into the design of the 2015 agreement could make it more durable in the face of new scientific discoveries, external changes and shocks, as well as evolving country circumstances. The focus of this paper is on the mitigation part of the 2015 agreement.