Material Cycles Division, National Institute for Environmental Studies, Tsukuba, Japan.
Institute for Sustainable Futures, University of Technology Sydney, Sydney, NSW, Australia.
Nat Commun. 2022 Jul 18;13(1):4158. doi: 10.1038/s41467-022-31806-2.
Decarbonization strategies for the cement and concrete sector have relied heavily on supply-side technologies, including carbon capture and storage (CCS), masking opportunities for demand-side intervention. Here we show that cross-cutting strategies involving both the supply and demand sides can achieve net-zero emissions by 2050 across the entire Japanese cement and concrete cycle without resorting to mass deployment of CCS. Our analysis shows that a series of mitigation efforts on the supply side can reduce 2050 CO emissions by up to 80% from baseline levels and that the remaining 20% mitigation gap can be fully bridged by the efficient use of cement and concrete in the built environment. However, this decarbonization pathway is dependent on how CO uptake by carbonation and carbon capture and utilization is accounted for in the inventory. Our analysis underscores the importance of including demand-side interventions at the heart of decarbonization strategies and highlights the urgent need to discuss how to account for CO uptake in national inventories under the Paris Agreement.
脱碳策略在水泥和混凝土行业严重依赖于供应方面的技术，包括碳捕获和储存（CCS），掩盖了需求方面干预的机会。在这里，我们表明，涉及供应和需求双方的交叉策略可以在不大量部署 CCS 的情况下，到 2050 年实现整个日本水泥和混凝土周期的净零排放。我们的分析表明，供应方面的一系列缓解措施最多可以将 2050 年的 CO 排放量从基准水平降低 80%，而剩余的 20%减排差距可以通过在建筑环境中高效使用水泥和混凝土来完全弥补。然而，这种脱碳途径取决于在清单中如何核算碳化和碳捕获与利用对 CO 的吸收。我们的分析强调了将需求方面的干预措施纳入脱碳战略核心的重要性，并突出了迫切需要讨论如何根据《巴黎协定》在国家清单中核算 CO 的吸收。
