Climate change is a collective action problem; only if all major emitting countries take sufficient mitigating actions, dangerous human interference with the climate system can be averted. In order to create and maintain a stable global climate coalition, trust needs to be established that all countries will contribute in accordance with the agreement, and that there will be no free riders. Therefore, for a successful global climate regime, it is essential that information is available, internationally, on actions taken per country. In the current climate negotiations, the availability and reliability of such information is commonly termed 'MRV' (Measurable, Reportable and Verifiable). MRV can increase trust between developed and developing countries and give meaning to common but differentiated responsibilities of countries.