This research aimed primarily to establish the role of diplomacy on climate change. It looked at the effect of climate change, assessed effectiveness of major groups of states, including non-state actors in managing climate change. It also examined the effectiveness of diplomacy in mitigating the impacts of climatic dynamism. Although, climate change has been widely covered by several scholars who made significant contributions of late, however, one feels there is a gap in understanding the role diplomacy has played and continues to play in addressing climate change problems. The study was pegged on the regime theory which points out to cooperation among member states and relevant actors in the global system, including non-states actors. The theory emphasizes that states and non-states actors, despite their different status in the international system can cooperate for a common good albeit the anarchical nature of the international system. Climate change has been around and it is a serious global threat that demands effective collaboration and cooperation of various stakeholders in mitigating its effects. The key hypotheses that guided the study were, climate change represents a global threat, there exist a significant relationship between diplomacy and climatic change as well, states and non-state actors have a role in addressing threats presented by both the climate change and diplomacy encounters challenges in climate change negotiations. The study relied on both quantitative and qualitative methods of data collection. Questionnaires were administered to diplomats from various member states, involved in climate change negotiations and staff of United Nations Environmental Programme (UNEP). Information was also obtained using qualitative methods in which secondary data formed the core data collection. From the study it was evident that industrialized economies are taken as the integral and responsible causal agents for continued emissions of dangerous gases to the atmosphere due to their accelerated industrial activities over decades. The study has also established that countries have made attempts through the different negotiations into the Earth’s atmosphere; however, there is still need for binding commitments. Based on my findings, there is need to improve the management of climate change matters. More attention should be given to building the knowledge and capacity of decision makers. Researchers should be closely associated in decision making process. In addition, more research needs to be conducted on the physical and human effects of climate change together with increased government funding for basic research is critical in this regard.