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Prominent British and American sources now seek to structure public understanding of C.C. by issuing “tipping point” forewarnings of danger with increasing frequency. This emerging trend announces a shift in the way we are likely to perceive and respond to C.C. dangers. This paper reviews key statements to suggest a significant dimension of this trend is its enrollment of epidemiological terminology to communicate urgent and uncertain threats. First, key events in the popular employment of epidemiological and public health models of explanation are reviewed. Second, the author discusses the C.C. “debate” to illuminate the limitations involved in treating C.C. as a public issue detached from other problems involving atmospheric science. Third, the author reconstructs the tipping point tendency in this context.