Existing territorial life cycle assessments (LCAs) consider all activities in a given geographical area, defined as the foreground system, but cannot lead to operational decisions. In product scale LCA, the foreground system is defined as the part of the system directly controlled by an actor and is thus more adapted to compare possible scenarios within a decision perimeter. The present paper uses that concept applied to a geographical area. The developed method consists of five steps: (a) definition of the foreground material flow analysis (MFA) or LCA system corresponding to the decision perimeter; (b) territorial MFA; (c) geo-location of activities and downscaling of territorial flows to individual activities; (d) calculation of local transport distances; and (e) calculation of LCA impact indicators. The case study concerns the management of primary and secondary resources of basic quality aggregates (BQAs) in the Loire-Atlantique department (France) in 2012. Our results show that the amount of recycled cement concrete is only 7% of total consumed BQAs, although 90% of cement concrete demolition waste (CCDW) is recycled. The environmental impacts are importantly related to off-site activities. Local impacts are mainly driven by the transport of aggregates. For land planning, a concentration of fewer recycling facilities with high authorised production capacities in main cities, close to where CCDW is mainly produced, would divide transport needs in half and thus considerably reduce environmental impacts.

现有的领土生命周期评估（LCA）考虑了给定地理区域（定义为前台系统）中的所有活动，但无法做出运营决策。在产品规模LCA中，前台系统被定义为由参与者直接控制的系统的一部分，因此更适合于比较决策范围内的可能场景。本文将这一概念应用于地理区域。所开发的方法包括五个步骤：（a）定义与决策范围相对应的前台物料流分析（MFA）或LCA系统；（b）领土外交部；（c）活动的地理位置和将地域流量缩减为单个活动；（d）计算当地运输距离；（e）计算LCA影响指标。该案例研究涉及2012年法国卢瓦尔-大西洋省基本质量骨料（BQA）的一级和二级资源的管理。我们的结果表明，尽管水泥再生混凝土的用量仅占总BQA消耗量的7％。回收了90％的水泥混凝土拆除废物（CCDW）。环境影响与场外活动密切相关。本地影响主要由骨料的运输驱动。在土地规划方面，在主要城市靠近CCDW主要生产地的情况下，在主要城市集中较少的具有高授权生产能力的回收设施，这将使运输需求减少一半，从而大大减少对环境的影响。我们的结果表明，尽管90％的水泥混凝土拆除废物（CCDW）被回收，但再生的水泥混凝土的数量仅占消耗的BQA总量的7％。环境影响与场外活动密切相关。本地影响主要由骨料的运输驱动。在土地规划方面，在主要城市靠近CCDW主要生产地的情况下，在主要城市集中较少的具有高授权生产能力的回收设施，这将使运输需求减少一半，从而大大减少对环境的影响。我们的结果表明，尽管90％的水泥混凝土拆除废物（CCDW）被回收，但再生的水泥混凝土的数量仅占消耗的BQA总量的7％。环境影响与场外活动密切相关。本地影响主要由骨料的运输驱动。在土地规划方面，在主要城市靠近CCDW主要生产地的情况下，在主要城市集中较少的具有高授权生产能力的回收设施，这将使运输需求减少一半，从而大大减少对环境的影响。