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Climate disinformation poses an increasingly pressing problem, which obstructs public understanding of climate science and collective policy decision making. But research about solutions to climate disinformation is still relatively scarce. This dissertation approaches the problem of climate disinformation as a confluence of social, political, and technological forces that contribute to fractured public consensus on what counts as credible knowledge and who has the legitimacy to produce and represent public knowledge. By focusing on cases of tech-driven disinformation interventions built by various social actors, this research identifies three distinct approaches: scientist-led fact-checking (Climate Central and Climate Feedback), tech entrepreneur-led media literacy (AllSides), and digital platform self-regulation (Facebook). I use in-depth, semi-structured interviews, discourse analysis, and ethnography of infrastructure to examine the processes through which these actors employ legitimizing strategies and leverage technology and discusses the implications of these processes on challenges and opportunities for professional journalism. The findings suggest that the issue of legitimacy is central for producing and representing public knowledge about climate change. For actors vying to shape public discourse about climate change, their legitimacy is shaped by distinct cultural ways of knowing and it is constantly contested, negotiated, and adapted to shifting social, political, and technological contexts of climate communication. These diverse epistemological frameworks of negotiating legitimacy provide insights for understanding the shifting dynamics of climate communication, epistemological challenges to repair fractured public consensus on climate change, and potential pathways for addressing climate disinformation. The findings highlight the vital role of journalism in bridging gap between scientific knowledge and public understanding of climate change, exposing fossil-fuel propaganda, and connecting social and environmental justice to the climate crisis. Ultimately, I suggest that effective interventions to climate disinformation requires reimagining institutional arrangements with communities of science, technology, and journalism that incorporate diverse and culturally specific epistemological frameworks.