While the 2015 Paris Agreement has been rightly celebrated as a significant achievement in terms of international climate diplomacy, it has also been criticised for being too little too late as far as climate change mitigation is concerned. Do we have to wait the decades that it will take to scientifically establish whether this criticism is on point or unfounded? Or should climate intervention technologies – commonly referred to as geoengineering – be supported and regulated by the UN Framework Convention on Climate Change as soon as possible? There is a very real chance that the Paris Agreement as it currently stands will fail to meet its objectives. Geoengineering technologies could buy the world some time, time that would allow the Paris Agreement’s plans for mitigation to take effect. If the UNFCCC is to succeed in combatting climate change, then it needs to create a space for robust and realistic dialogue on geoengineering. This paper will argue that the most appropriate legal mechanism to regulate geoengineering is the UNFCCC. Moreover, rules to govern the use of climate intervention technologies should be developed under the auspices of the UNFCCC at the earliest opportunity to give the Paris Agreement every chance of success. This paper will explore whether a legal framework to regulate the development of geoengineering could be created through decisions of the COP, or whether an amendment to existing treaties would be required.