Public views and values about solar geoengineering should be incorporated in science-policy decisions, if decision makers want to act in the public interest. In reflecting on the past decade of research, we review around 30 studies investigating public familiarity with, and views about, solar geoengineering. A number of recurring patterns emerge: (1) general unfamiliarity with geoengineering among publics; (2) the importance of artifice versus naturalness; (3) some conditional support for certain kinds of research; and (4) nuanced findings on the "moral hazard" and "reverse moral hazard" hypotheses, with empirical support for each appearing under different circumstances and populations. We argue that in the coming decade, empirical social science research on solar geoengineering will be crucial, and should be integrated with physical scientific research.

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The dynamical behavior of domestic political hostility is modeled in terms of the interaction between hostile (challenger) and ruling (regime) groups. The conditions under which the conflict situation will either settle down in a steady state or evolve in time are derived for various forms of collective action costs. The model presented is a general framework for explaining the various outcomes of the repression/dissent nexus as special cases of the same fundamental process. We also obtain critical parameter values of discontent that bring about discontinuous jumps in the level of hostility.

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