An alternative approach to establishing trade-offs among greenhouse gases

Alan Manne and Richard G. Richels ()
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Richard G. Richels: Electric Power Research Institute (EPRI), PO Box 10412

Nature, 2001, vol. 410, issue 6829, 675-677

Abstract: Abstract The Kyoto Protocol permits countries to meet part of their emission reduction obligations by cutting back on gases other than CO2 (ref. 1). This approach requires a definition of trade-offs among the radiatively active gases. The Intergovernmental Panel on Climate Change has suggested global warming potentials for this purpose2, which use the accumulated radiative forcing of each gas by a set time horizon to establish emission equivalence. But it has been suggested that this approach has serious shortcomings: damages or abatement costs are not considered3,4,5,6,7,8,9,10 and the choice of time horizon for calculating cumulative radiative force is critical, but arbitrary5. Here we describe an alternative framework for determining emission equivalence between radiatively active gases that addresses these weaknesses. We focus on limiting temperature change and rate of temperature change, but our framework is also applicable to other objectives. For a proposed ceiling, we calculate how much one should be willing to pay for emitting an additional unit of each gas. The relative prices then determine the trade-off between gases at each point in time, taking into account economical as well as physical considerations. Our analysis shows that the relative prices are sensitive to the lifetime of the gases, the choice of target and the proximity of the target, making short-lived gases more expensive to emit as we approach the prescribed ceiling.

Date: 2001
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DOI: 10.1038/35070541

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