Abstract
This paper introduces geoengineering into an optimal control model of climate change economics. Together with mitigation and adaptation, carbon and solar geoengineering span the universe of possible climate policies. We show in the context of our model that: (i) a carbon tax is the optimal response to the unpriced carbon externality only if it equals the marginal cost of carbon geoengineering; (ii) the introduction of solar geoengineering leads to higher emissions yet lower tempera- tures, and, thus, increased welfare; and (iii) solar geoengineering,in effect, is a public goods version of adaptation that also lowers temperatures.
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