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Die Abschätzung der Kosten des anthropogenen Treibhauseffekts: dominieren normative Setzungen die Ergebnisse?

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  • Olav Hohmeyer

Abstract

The results of economic evaluations of the effects of anthropogenic climate change diverge significantly. The main reason are three normative assumptions which result in monetary values of the same climate impact diverging by the order of six magnitudes and more. The paper illustrates this problem by taking the case of crop losses due to climate change as an example. The resulting values are inappropriate to balance the cost and benefits of climate change mitigation if not legitimated by a societal consensus about the underlying normative value assessment. Altogether, a consensus about a maximum acceptable concentration of climate gases would seem more appropriate and allow to deduce maximum emissions per year and country. Die Ergebnisse ökonomischer Bewertungen der Auswirkungen des anthropogenen Treibhauseffekts weichen stark voneinander ab. Die Ursache liegt in drei entscheidenden normativen Annahmen, mit dem Ergebnis, dass die monetären Werte der gleichen Klimaauswirkungen um sechs und mehr Größenordnungen auseinander liegen. Der Beitrag veranschaulicht diesen Zusammenhang am Beispiel von Ernteausfällen aufgrund von Klimaveränderungen. Die resultierenden Werte sollten in keinem Fall für eine Abwägung der Kosten und Nutzen der Vermeidung des anthropogenen Treibhauseffekts verwendet werden, wenn nicht zuvor ein gesellschaftlicher Konsens über die zugrunde liegenden normativen Wertentscheidungen erzielt worden ist. Zielführender wäre es, sich auf ein maximal tolerierbares Konzentrationsniveau von Treibhausgasen zu einigen und hieraus maximale jährliche Emissionsmengen für jedes Land abzuleiten.

Suggested Citation

  • Olav Hohmeyer, 2005. "Die Abschätzung der Kosten des anthropogenen Treibhauseffekts: dominieren normative Setzungen die Ergebnisse?," Vierteljahrshefte zur Wirtschaftsforschung / Quarterly Journal of Economic Research, DIW Berlin, German Institute for Economic Research, vol. 74(2), pages 164-168.
  • Handle: RePEc:diw:diwvjh:74-2-4
    DOI: 10.3790/vjh.74.2.164
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    3. Rabl, Ari, 1996. "Discounting of long-term costs: What would future generations prefer us to do?," Ecological Economics, Elsevier, vol. 17(3), pages 137-145, June.
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