Designing an international climate action agreement that can reduce global greenhouse gas (GHG) emissions over the coming decades will be a key focus of discussions at COP 19 this week. A critical component of this new agreement will be the design of national mitigation commitments for countries’ emissions reductions post-2020. This is a complex process, involving a significant number of options. The ease with which emissions and emissions reductions associated with mitigation commitments can be measured is a key consideration. It is critical for strengthening domestic GHG management and helping track national and global emissions reductions. New WRI analysis focuses on how to maximize “measurability” and aims to shed light on how countries can most effectively design their commitments accordingly.