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Differentiating emissions targets for individual developed countries: economics and equity

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  • Reisinger, Andy
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    Abstract

    A key challenge for a future climate change agreement is allocating emissions targets for individual developed countries that are perceived as equitable given differing national circumstances. Many economics-based frameworks for evaluating future targets use as a key criterion for individual country targets the notion that mitigation measures should result in similar costs (specifically, that the required mitigation actions relative to baseline emissions result in a similar percentage reduction of individual countries' GDP in the target year or period). Such an economic criterion provides a transparent and objective basis for comparison, but it does not necessarily mean that comparable targets for individual countries are also equitable. A set of thought experiments demonstrates that such an approach indeed does not reflect equity between countries. This is because future business-as-usual emissions, against which the costs of mitigation are assessed, depend on past policy choices and mitigation pathways. An approach that sets future emissions targets at a specific date based on comparable costs, without regard to past policy choices and commitments, would penalise countries that have taken early action and provides a disincentive for taking strong domestic mitigation actions in future. This analysis suggests that the choice of 'business-as-usual' emissions against which the future costs of mitigation are assessed needs to receive more attention if economic comparability is intended to also reflect equity of emissions targets over time. --

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    Bibliographic Info

    Paper provided by Kiel Institute for the World Economy in its series Economics Discussion Papers with number 2009-41.

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    Date of creation: 2009
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    Handle: RePEc:zbw:ifwedp:200941

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    Keywords: Greenhouse gas mitigation; equity of emissions targets; comparability; economic impact; path-dependence; optimal policy design;

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