Metrics for Aggregating the Climate Effect of Different Emissions: A Unifying Framework
AbstractMulti-gas approaches to climate change policies require a metric establishing ?equivalences? among emissions of various species. Climate scientists and economists have proposed four classes of such metrics and debated their relative merits. We present a unifying framework that clarifies the relationships among them. We show that the Global Warming Potential, used in international law to compare greenhouse gases, is a special case of the Global Damage Potential, assuming (1) a finite time horizon, (2) a zero discount rate, (3) constant atmospheric concentrations, and (4) impacts that are proportional to radiative forcing. We show that the Global Temperature change Potential is a special case of the Global Cost Potential, assuming (1) no induced technological change, and (2) a short-lived capital stock. We also show that the Global Cost Potential is a special case of the Global Damage Potential, assuming (1) zero damages below a threshold and (2) infinite damage after a threshold. The UN Framework Convention on Climate Change uses the Global Warming Potential, a simplified cost-benefit concept, even though the UNFCCC frames climate policy as a cost-effectiveness problem and should therefore use the Global Cost Potential or its simplification, the Global Temperature Potential.
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Bibliographic InfoPaper provided by Economic and Social Research Institute (ESRI) in its series Papers with number WP257.
Length: 21 pages
Date of creation: Sep 2008
Date of revision:
Climate change; multi-gas climate policy; Global Warming Potential; equivalences between greenhouse gases;
This paper has been announced in the following NEP Reports:
- NEP-ALL-2008-10-07 (All new papers)
- NEP-ENE-2008-10-07 (Energy Economics)
- NEP-ENV-2008-10-07 (Environmental Economics)
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