Buildings are one of the main drivers of greenhouse gas (GHG) emissions and their life cycle emissions need to be significantly reduced in order to address the unprecedented climate emergency. While there are numerous studies on zero operational energy and GHG emissions buildings, very few studies exist on buildings that aim to reach zero life cycle GHG emissions buildings. The apartment building typology is particularly challenging due to the very small roof area per apartment and the limited capacity for renewable energy generation. This study investigates a four-storey apartment building in Sehaileh, Lebanon and modifies it to reach zero life cycle GHG emissions through a series of measures targeting embodied and/or operational GHG emissions. Both a life cycle GHG emissions analysis and a life cycle cost analysis are conducted on all measures their combination, including the installation of a 50kW_p photovoltaic array for the building. Results demonstrate that it is possible to achieve zero life cycle GHG emissions for that building typology and number of storeys, in a Lebanese Mediterranean climate, but at a net life cycle cost of ∼43 kUSD2020 over 50 years, compared to the base case guilding. Implications in terms of policy and further research are discussed.

建筑物是温室气体 (GHG) 排放的主要驱动因素之一，需要大幅减少其生命周期排放，以应对前所未有的气候紧急情况。虽然有许多关于零运营能源和温室气体排放建筑物的研究，但很少有关于旨在实现零生命周期温室气体排放建筑物的研究。由于每间公寓的屋顶面积非常小，可再生能源发电能力有限，公寓建筑类型尤其具有挑战性。本研究调查了黎巴嫩 Sehaileh 的一栋四层公寓楼，并通过一系列针对具体和/或运营温室气体排放的措施对其进行了修改，以实现零生命周期温室气体排放。_p用于建筑物的光伏阵列。结果表明，在黎巴嫩地中海气候下，该建筑类型和层数可以实现零生命周期温室气体排放，但与基本情况相比，50 年的净生命周期成本约为 43 kUSD2020。讨论了政策和进一步研究方面的影响。