A Pedagogical “Toy” Bistable Climate Model J. I. Katz ∗ Department of Physics and McDonnell Center for the Space Sciences Washington University, St. Louis, Mo. 63130 (Dated: November 6, 2018) A “toy” model, simple and elementary enough for an undergraduate class, of the temperature dependence of the greenhouse (mid-IR) absorption by atmospheric water vapor implies a bistable climate system. The stable states are glaciation and warm interglacials, while intermediate states are unstable. This is in qualitative accord with the paleoclimatic data. The present climate may be unstable, with or without anthropogenic interventions such as CO 2 emission, unless there is additional stabilizing feedback such as “geoengineering”. PACS numbers: 92.70.-j, 92.70.Aa, 92.70.Gt Keywords: climate, opacity, water vapor, radiative feedback 1 Abstract arXiv:1002.1672v1 [physics.soc-ph] 8 Feb 2010