Abstract: With the advancement of global "dual carbon" targets and the strategic deployment of green and low-carbon development in China's "15th Five-Year Plan" (2026–2030), the automotive industry is accelerating its transition toward green and low-carbon transformation. Bio-based materials, due to their renewability, low carbon emissions, biodegradability, and reduced dependence on petroleum-based resources, have become a crucial material choice for sustainable, low-carbon development in the automotive sector. However, systematic and standardized methods for quantifying their life cycle environmental impacts–especially carbon footprint-remain lacking. Based on the content of the invention patent for carbon footprint accounting methods of bio-based materials in Great Wall Motor, this paper systematically investigates the technical framework,implementation pathways, and application value of a "cradle-to-gate" carbon footprint accounting method for automotive bio-based materials. The study indicates that this method constructs a comprehensive carbon footprint assessment model covering the entire process from cultivation to production and factory output, by integrating crop plant information, on-site data collection, multi-stage carbon emission factor calculation, and carbon sequestration offset mechanisms. The model is further enabled by electronic devices and computer programs for automated accounting. This research holds significant application value in automotive material selection, carbon emission management, and green certification, providing technical support for achieving the strategic goal of "accelerating the comprehensive green transformation of economic and social development" as outlined in the "15th Five-Year Plan".

Key words: bio-based materials; carbon footprint; automotive applications; carbon sequestration offset

摘要： 随着全球“双碳”目标的推进及我国“十五五”规划（2026－2030 年）对绿色低碳发 展的战略部署，汽车行业正加速向绿色低碳转型。生物基材料因其可再生性、低碳排放、易 降解和减少对石油基依赖等特性，已成为汽车行业低碳可持续发展的重要材料选择。然而， 其生命周期环境影响，尤其是碳足迹的量化评估，仍缺乏系统性、标准化的核算方法。文章 基于长城汽车生物基材料碳足迹核算方法发明专利的内容，系统探究了车用生物基材料“摇 篮到大门”碳足迹核算方法的技术框架、实现路径与应用价值。研究指出，该方法通过整合 作物植株信息、实景数据采集、多阶段碳排放因子计算与固碳量抵消机制，构建了覆盖种植、 生产、出厂全流程的碳足迹评估模型，并借助电子设备与计算机程序实现自动化核算。该研 究在汽车材料选型、碳排放管理及绿色认证中具有显著应用价值，为响应“十五五”规划中 “加快经济社会发展全面绿色转型”的战略要求提供技术支撑。

关键词: 生物基材料；碳足迹；汽车应用；固碳抵消