In a rapidly changing and interconnected world, it is assumed that the protection of global public goods increasingly requires the resort to flexible forms of ruling. Accordingly, several and dynamically evolving global governance mechanisms have had a deep impact on international law over the past few decades. Most of these mechanisms are innovative regulatory techniques at the global level, which are difficult to grasp from within the doctrine of sources of international law, but which are highly effective and continue evolving. The course will analyze the main global regulatory techniques in fields such as climate change, sustainable development, and international security. Furthermore, it will delve into the significance of these regulatory evolutions for the structures of international law.