Öz
As the problems related to the global climate crisis have turned into a threat, the issue of sustainability has gained more importance in the political and academic circles in the world. Preventing global warming has necessitated global cooperation. In this regard, besides the formation of extensive literature, necessary concrete steps have been taken. It is generally accepted that the sustainable development efforts of developing countries need financial support. In this study, in order to explain the development differences between countries, attention is drawn to the effect of intertemporal externalities, in other words, the effects of not being internalized in the past. Accordingly, it is argued in the study that intertemporal externalities should be taken into account in global actions related to the environment. The purpose of this study is to ground the need to internalize the global environmental costs accumulated in the historical process. For this purpose, a descriptive and interpretive method has been followed within the framework of a post-positivist methodological approach, and historical and current data on carbon emissions are presented with the help of figures. The findings obtained in the study show that developed country emissions are at the root of the emerging climate crisis. As a result, first of all, it is necessary that developing countries' equality of opportunity in development should not be deteriorated due to the climate crisis. It is appropriate to apply global financing methods in financing environmental problems, but the effects of intertemporal externalities from the past should also be internalized. In the emergence of this phenomenon, which can be spread over two centuries as an intertemporal externality, it is necessary in terms of human values for developed countries to make more efforts to assume responsibilities.