The science of economics has made a number of important contributions to understanding greenhouse gases and their optimal control. From basic economic theory, economists have pointed out the need to minimize the sum of mitigation costs and climate damages (Nordhaus 1992). From this simple insight, society can derive an elegant solution to greenhouse gases. The optimal policy for society should balance marginal mitigation costs with marginal damages. Economics also provides an important perspective on time. Time is valuable and cannot be ignored. This is especially critical for a problem that has a very long time horizon. Costs borne in the present are more burdensome than costs born in the future. Finally, economics has much to offer in quantifying both the...

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