Harmonization vs. fragmentation: overview of climate policy scenarios in EMF27
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- 作者：Geoffrey J. Blanford (1)
Elmar Kriegler (2)
Massimo Tavoni (3) - 刊名：Climatic Change
- 出版年：2014
- 出版时间：April 2014
- 年：2014
- 卷：123
- 期：3-4
- 页码：383-396
- 全文大小：372 KB
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Elmar Kriegler (2)
Massimo Tavoni (3)
1. Electric Power Research Institute (EPRI), Palo Alto, CA, USA
2. Potsdam Institute for Climate Impact Research (PIK), Potsdam, Germany
3. Fondazione Eni Enrico Mattei (FEEM), Milan, Italy - ISSN：1573-1480
文摘
This paper synthesizes results of the multi-model Energy Modeling Forum 27 (EMF27) with a focus on climate policy scenarios. The study included two harmonized long-term climate targets of 450?ppm CO2-e (enforced in 2100) and 550?pm CO2-e (not-to-exceed) as well as two more fragmented policies based on national and regional emissions targets. Stabilizing atmospheric GHG concentrations at 450 and 550?ppm CO2-e requires a dramatic reduction of carbon emissions compared to baseline levels. Mitigation pathways for the 450 CO2-e target are largely overlapping with the 550 CO2-e pathways in the first half of the century, and the lower level is achieved through rapid reductions in atmospheric concentrations in the second half of the century aided by negative anthropogenic carbon flows. A fragmented scenario designed to extrapolate current levels of ambition into the future falls short of the emissions reductions required under the harmonized targets. In a more aggressive scenario intended to capture a break from observed levels of stringency, emissions are still somewhat higher in the second half due to unabated emissions from non-participating countries, emphasizing that a phase-out of global emissions in the long term can only be reached with full global participation. A key finding is that a large range of energy-related CO2 emissions can be compatible with a given long-term target, depending on assumptions about carbon cycle response, non-CO2 and land use CO2 emissions abatement, partly explaining the spread in mitigation costs.