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Since anthropogenic C.C. first emerged on the public agenda, public communication of C.C. and the question of how to communicate it most effectively have witnessed a steep rise. This paper synthesizes what is known, presumed, and still unknown about how to effectively communicate this problem. An introductory historical overview of C.C. communication is followed by a discussion of the challenges that communicators face in trying to convey the issue (invisibility of causes, distant impacts, lack of immediacy and direct experience of the impacts, complexity and uncertainty, perceptual limits and self-interest). The core of the paper focuses on key aspects of the communication process (purpose and scope of the communication, audience, framing, messages, messengers). These elements are placed in relationship to several contextual factors that affect the communication process. The paper concludes with suggestions for future research on C.C. communication.