未使用のパワーサージが米国道路車両の持続可能性を損なう

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:構造と活動の分離（使用率）を測る指標は、素材ストックとエネルギーの統合分析に応用できる。

🏢実務担当者:車両の過大動力・車隊冗長性を見直すことが、電動化移行期の素材コストと調達リスク低減につながる。

🏛政策担当者:電動化支援策は車両サイズ・動力の適正化インセンティブと組み合わせる必要がある。

Material and energy flows underpin sociotechnical metabolism. However, despite growing sustainability concerns over expanding material stocks and declining stock productivity, the link between material use and energy consumption remains poorly understood. This gap reflects a limited distinction between structures and the activity they enable, and the lack of quantification of the installed power of energy consuming structures. Here we reconstruct the long-term growth dynamics of U.S. road vehicles, distinguishing professional and consumer assets. We show that installed power, mass, and fuel energy use follow divergent patterns within and across vehicle categories. By introducing the usage factor as a metric linking structure to activity, we quantify decoupling mechanisms such as engine oversizing and fleet redundancy, which drive up material immobilization. As electrification requires large-scale fleet replacement, our findings highlight that avoiding power oversized vehicles could reduce material demand, emphasizing the need to account for structure-activity decoupling in energy transition policies.

• openalex https://arxiv.org/abs/2609.24543first seen 2026-10-09 04:41:23