A Strategic Analysis of Global Warming: Theory and Some Numbers

Abstract

We model the global warming process as a dynamic commons game in which the players are countries, their actions at each date produce emissions of greenhouse gases, and the state variable is the current stock of greenhouse gases. The theoretical analysis is complemented by a calibration exercise. The first set of results establishes theoretically and then empirically the over-emissions due to a tragedy of the commons. The power of simple sanctions to lower emissions and increase welfare is then examined as is the e¤ect of cost asymmetry. Finally, a complete theoretical charactrization is provided for the best equilibrium and it is shown that it has a very simple structure; it involves a constant emission rate through time.

Keywords: Global Warming, Dynamic Games, Tragedy of the Comm

JEL Classification: D90, Q54, C73