This chapter examines the evolution and challenges of international climate governance, emphasizing the progression from scientific recognition to a global concern. It highlights the pivotal roles of the UNFCCC, Kyoto Protocol, and Paris Agreement in establishing frameworks for collective climate action. While these agreements have advanced international cooperation, their effectiveness is hampered by weak enforcement mechanisms and financial constraints. The analysis underscores the gaps between commitments and implementation, particularly under the Paris Agreement, and stresses the importance of bridging divides between developed and developing countries. Cross-fertilization with other legal realms, such as trade law, is proposed to strengthen climate norms and address structural deficiencies within the UN regime.