[ D] The stabilisation of global greenhouse gas emissions represents a global public good, i.e. no country can be excluded from using the good and there is no rivalry in consumption. Unfortunately, if standard economic theory is right, free-riding would be the dominant strategy in such a game. Against this background the basic research being conducted by the research area analyses the determinants of voluntary cooperation among sovereign states. Why do we observe international treaties? What is needed to overcome the situation of a prisoner's dilemma in order to achieve co-operation between sovereign Parties? Of primary interest here is the question concerning the influence of equity beliefs and distinct burden sharing rules on the success chances of international treaties.