Recent estimates suggest that the construction sector accounts for approximately one quarter of global CO₂ emissions. This paper assesses the potential for reducing the climate impact of road construction. The study is structured as a participatory integrated assessment with involvement from key stakeholders in the supply chain, supported by energy and material flow mapping, an extensive literature review and a scenario analysis. The results indicate that it is technically possible to halve road construction CO₂ emissions with today's best available technologies and practices, to abate more than three quarters of the emissions by 2030 and achieve close to net zero emissions by 2045. Realising the current potential would rely on sufficient availability of sustainably produced second-generation biofuels, indicating a need to speed up the implementation of alternative abatement measures, including optimization of material use and mass handling requirements, increased recycling of steel, asphalt and aggregates and enhanced use of alternative binders in concrete. Policy measures and procurement strategies should be aligned to support these measures with a clear supply chain focus. For deep decarbonization several key opportunities and obstacles for realisation of breakthrough technologies for basic industry are highlighted – including electrification and carbon capture for steel and cement, and hybridisation and electrification for heavy transport and construction equipment. There is a clear need to prepare for deeper abatement and associated transformative shifts already now and to carefully consider the pathway of getting there while avoiding pitfalls along the way, such as overreliance on biofuels or cost optimizations which cannot be scaled up to the levels required.

最近的估计表明，建筑行业约占全球CO ₂排放量的四分之一。本文评估了减少道路建设对气候影响的潜力。这项研究的结构为参与式综合评估，供应链中主要利益相关者参与其中，并辅以能源和物料流图绘制，广泛的文献综述和情景分析。结果表明，将道路建设中的CO ₂减半在技术上是可能的采用当今最先进的技术和方法，可在2030年前减少四分之三的排放，到2045年实现接近零净排放。要实现当前的潜力，将依赖于可持续生产的第二代生物燃料的充足供应，这表明需要加快实施替代减排措施，包括优化材料使用和质量处理要求，增加钢，沥青和骨料的回收利用，以及增强混凝土中替代粘合剂的使用。应调整政策措施和采购策略，以明确的供应链重点支持这些措施。对于深度脱碳，强调了实现基础工业突破性技术的几个关键机遇和障碍–包括钢和水泥的电气化和碳捕获，以及重型运输和建筑设备的混合化和电气化。显然，现在需要为更深层次的减排和相关的转型转变做准备，并认真考虑到达那里的途径，同时避免一路上的陷阱，例如对生物燃料的过度依赖或无法优化到所需水平的成本优化。