Climate policy decisions require policy-based lifecycle analysis.
Climate policy decisions require policy-based lifecycle analysis.
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DOI：
10.1021/es405164g
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发表时间：
2014-05
影响因子：
11.4
通讯作者：
A. Bento;R. Klotz
中科院分区：
文献类型：
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作者：
A. Bento;R. Klotz
温室气体排放的生命周期分析（LCA）指标越来越多地被用于选择气候政策支持的技术。然而，lca通常评估与技术或产品相关的排放，而不是政策的影响。在这里，我们表明，由于多种市场对政策的反应，支持相同技术的政策可能导致单位技术增加的排放影响显著不同。使用基于政策的相应LCA，我们发现美国四项生物燃料政策的生命周期排放影响范围从每MJ玉米乙醇减少16.1 gCO2e到增加24.0 gCO2e不等。这些结果与代表性的基于技术的LCA度量之间的差异，说明了在为政策决策提供信息时，需要基于政策的LCA度量。
Lifecycle analysis (LCA) metrics of greenhouse gas emissions are increasingly being used to select technologies supported by climate policy. However, LCAs typically evaluate the emissions associated with a technology or product, not the impacts of policies. Here, we show that policies supporting the same technology can lead to dramatically different emissions impacts per unit of technology added, due to multimarket responses to the policy. Using a policy-based consequential LCA, we find that the lifecycle emissions impacts of four US biofuel policies range from a reduction of 16.1 gCO2e to an increase of 24.0 gCO2e per MJ corn ethanol added by the policy. The differences between these results and representative technology-based LCA measures, which do not account for the policy instrument driving the expansion in the technology, illustrate the need for policy-based LCA measures when informing policy decision making.