“Common but differentiated responsibilities” (CBDR) is a principle in international environmental law that recognizes that while all countries share the obligation to address global environmental issues, such as climate change, their responsibilities and capabilities to do so differ based on their historical contributions to the problem and their current economic and technological capacities. This concept acknowledges that developed nations, having historically contributed more to environmental degradation, should take on a greater share of the burden in mitigating and adapting to environmental challenges, while providing support to developing nations. Implementing CBDR involves several key actions. Developed countries can commit to more ambitious targets for reducing greenhouse gas emissions, reflecting their greater responsibility and capacity to do so. They should also provide financial and technological support to developing countries to help them transition to sustainable practices. In international agreements, CBDR can be operationalized through differentiated timelines, financial commitments, and flexibility mechanisms that allow developing nations to meet their obligations at a pace consistent with their development goals. Ensuring that all countries are involved in the decision-making process, and that the principle of equity is maintained, is crucial for the successful implementation of CBDR, fostering global cooperation and fairness in addressing environmental challenges.