Climate change litigation has, to date, largely been limited to the domestic legal sphere due to the lack of binding dispute settlement procedures in international climate change treaties and agreements. Yet, it is the oft-stated and unfortunate reality that the states which have contributed the least to the causes of climate change are often those that are already and will continue to feel its effects most harshly. Unlike the prominent climate change instruments such as the UNFCCC or the Paris Agreement, the UNCLOS contains compulsory binding third party dispute settlement procedures. Therefore, this article looks at the extent to which UNCLOS can be relied upon, and its role as an alternative approach for disproportionately affected states to achieve effective global mitigation outcomes. Instinctively, the UNCLOS may not be the first port of call for climate change litigators and activists, since it was designed primarily to govern issues of the law of the sea. However, there are provisions within UNCLOS which regulates all forms of pollution that harm the marine environment, and therefore encompasses climate change causes and effects.