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Abstract: Global climate change has been increasingly defined as a security threat by a range of political actors and analysts. Yet as the range of voices articulating the need to conceive and approach climate change as a security issue has expanded, so too has the range of ways in which this link has been conceptualized. This article systematically maps different approaches to the relationship between climate change and security as climate security discourses, divided here between national, human, international and ecological security discourses. In exploring the contours of each, the articles asks how the referent object of security is conceptualised (whose security is at stake?); who are conceived as key agents of security (who is responsible for/able to respond to the threat?); how is the nature of the threat defined; and what responses are suggested for dealing with that threat? Systematically mapping these alternative discourses potentially provides a useful taxonomy of the climate change–security relationship in practice. But more importantly, it serves to illustrate how particular responses to climate change (and the actors articulating them) are enabled or constrained by the ways in which the relationship between security and climate change is understood. The article concludes by suggesting that the most powerful discourses of climate security are unlikely to inform a progressive or effective response to global climate change. [Copyright &y& Elsevier]