The second half of the twentieth century has been determined by the interdependence among the States, due to the interlacement of economics and politics.On account of that the agenda of politics has become more varied and complex. It is not possible anymore to analyse the International Relations only from power politics approach based on the idea of Security, as realistic and neo-realist theoriticians proclaim. Neoliberal Institutionalists defend that the interdependence develops cmmon interests and values which can produce the cooperation among the actors, that are not States only. In an international system determined by anarchy, even the cost/ benefit calculation can lead actors to the promotion of the costly process of politics bargain which leads to the co-ordination of politics, in other words, to cooperation. The control of the collective action dilemma would be reasonably reached by constructing regimes. The politics bargain that permits the construction, in the 70s, of an international environmental politics or the cosntruction of regimes that search for norms of an international politics to prevent and control the pollution of the sea by accidental and operational spillage of oil can be analysed by the logic of cooperation instead of conflict. The distinction given to the 70s comes from the fact that it is the moment of the birth of the ecological era. It is also a period determined by the effort of building the détente among USA and URSS. A cooperative politics for the environment can be seen as an essential part of the construction of the historical moment of distension of the Cold War.