A sequential-decision strategy for abating climate change View Full Text


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Article Info

DATE

1992-05

AUTHORS

James K. Hammitt, Robert J. Lempert, Michael E. Schlesinger

ABSTRACT

CURRENT debate on policies for limiting climate change due to greenhouse-gas emissions focuses on whether to take action now or later, and on how stringent any emissions reductions should be in the near and long term. Any reductions policies implemented now will need to be revised later as scientific understanding of climate change improves. Here we consider the effects of a sequential-decision strategy (Fig. 1) consisting of a near-term period (1992–2002) during which either moderate emissions reductions (achieved by energy conservation only) or aggressive reductions (energy conservation coupled with switching to other fuel sources) are begun, and a subsequent long-term period during which a least-cost abatement policy is followed to limit global mean temperature change to an optimal target ΔT*. For each policy we calculate the global mean surface temperature change ΔT(t) using a simple climate/ocean model for climate sensitivities ΔT2x. (the response to doubled CO2, concentrations) of 4.5,2.5,1.5 and 0.5 °C. The policy beginning with moderate reductions is less expensive than that with aggressive reductions if ΔT*>2.9, 2.1, 1.5 and 0.9 °C respectively; otherwise, the aggressive-reductions policy is cheaper. We suggest that this approach should assist in choosing realistic targets and in determining how best to implement emissions reductions in the short and long term. More... »

PAGES

315-318

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/357315a0

DOI

http://dx.doi.org/10.1038/357315a0

DIMENSIONS

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