Abstract
Our society has multiple objectives, and climate mitigation is not our only aim. It is important to balance such multiple objectives, which include climate change mitigation measures. Desirable long-term emission targets cannot be determined without value judgments. However, atmospheric CO2 concentration stabilization at 550 ppm CO2 or 550 ppm CO2-eq is a reasonable target when taking into account several factors including climate mitigation costs, residual impacts of climate change, and avoidance of abrupt climate change. The world consists of various countries, and they differ from each other in terms of economic growth stage, industrial structure, energy-saving achievement, potential renewable energy, and the like. It is very important for all countries to undertake significant efforts while recognizing such differences. Responses to climate change should be harmonized with sustainable development policies. Furthermore, sustainable efforts to mitigate climate change require equitable emission reduction targets. Without them, it is impossible to work for emission reductions sustainably over the long-term, which is indispensable for climate stabilization.
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Notes
- 1.
The project was conducted between April 2002 and March 2007.
- 2.
The project was conducted between April 2007 and March 2012.
- 3.
The GHG emission in 2000 is reported to be 41 GtCO2 by Alcamo (2010). The emission gap between the reported emission and the assumption of this study is 6.5 GtCO2 in 2000. Most emissions can be explained as emission from change of land use. The emission from land use will be assumed to reduce linearly and to be zero in 2100. Under the assumption, the emission in 2020 is 5.2 GtCO2.
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Akimoto, K. (2012). Mitigation Targets and Effort-Sharing Among Regions and Countries. In: Yamaguchi, M. (eds) Climate Change Mitigation. Lecture Notes in Energy, vol 4. Springer, London. https://doi.org/10.1007/978-1-4471-4228-7_3
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