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テキサス州における2050年までの都市高密度化に伴うアップフロント炭素フットプリントを定量化する手法

A method for quantifying the upfront carbon footprint of urban densification in Texas through 2050 (原題)

K. Lucas Bons, Grace C. Scarborough, Harry Kennard, Michael E. Webber

Carbon Footprints📚 査読済 / ジャーナル2026-10-30#炭素会計Origin: US対象セクター: construction
DOI: 10.20517/cf.2026.76
原典: https://doi.org/10.20517/cf.2026.76

🤖 gxceed AI 要約

日本語

テキサス州の2050年までの都市高密度化に伴うアップフロント炭素フットプリントを、土地被覆変化予測・建築ストック分析・炭素隔離量の定量を組み合わせた新手法で推計した研究。スプロール・現状維持・高密度化の3シナリオを比較し、高密度化シナリオでは建材由来の内包炭素が71%を占める一方、スプロールでは農地・森林転用による炭素隔離損失が最大要因となった。高密度化は土地炭素効果と建材内包炭素のトレードオフを伴い、都市化政策で考慮すべきと結論づける。

English

This study quantifies the upfront carbon footprint of urban densification in Texas through 2050 using a novel method combining land-cover projections, building stock analysis, and carbon sequestration accounting. Across Sprawl, Business-as-Usual, and Built-Up scenarios, embodied building-material emissions reached 71% of the footprint in Built-Up cases but only 40% in Sprawl, where lost sequestration dominated. Higher densification yields a larger upfront footprint, creating a tradeoff between land-carbon effects and embodied emissions that urbanization policy should weigh.

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

📝 gxceed 編集解説 — Why this matters

日本のGX文脈において

日本でも都市再開発・コンパクトシティ政策が進む中、建設時の内包炭素（Scope 3）と土地利用変化のトレードオフを定量化する手法は、自治体の脱炭素計画や建設業のScope 3算定に応用可能。SSBJ開示における建設・不動産セクターの内包排出把握の参考になる。

In the global GX context

As ISSB/CSRD push Scope 3 and embodied-emissions disclosure, this method offers a way to quantify land-use and construction-material carbon tradeoffs in urban planning. It adds to global disclosure scholarship by linking densification policy scenarios to upfront carbon accounting, relevant to real estate and construction sector transition planning.

👥 読者別の含意

🔬研究者:都市化と内包炭素を統合した定量フレームワークとして、土地利用・建設・炭素隔離を横断する研究設計の参考になる。

🏢実務担当者:建設・不動産企業が再開発案件のScope 3内包炭素と土地利用影響を評価する際のシナリオ手法として活用できる。

🏛政策担当者:都市化・コンパクトシティ政策の立案時に、内包炭素と土地炭素のトレードオフを考慮する必要性を示す。

📄 Abstract（原文）

Urbanization is a major contributor to greenhouse gas emissions, and the Intergovernmental Panel on Climate Change projects that urban areas may grow by up to 211% globally by 2050. Embodied emissions make up a considerable portion of the total carbon footprint of urban areas. This study explores the relationship between urban densification and its upfront carbon footprint in Texas through 2050, using a novel method that combines land cover change projections, building stock analysis, and carbon sequestration quantification. Three densification trajectories–Sprawl, Business as Usual, and Built-Up–were used to demonstrate the method's ability to quantify upfront carbon footprint for a range of plausible urbanization outcomes. The analysis found that embodied emissions from building materials made up 71% of the upfront carbon footprint in Built-Up scenarios but only 40% in Sprawl scenarios, where lost carbon sequestration from the conversion of fields and forests to buildings and roads was the most significant factor. The central finding of this study is that high levels of urban densification lead to a larger upfront carbon footprint. Dense urban cores reduce natural land conversion but at the expense of increased emissions from the construction materials required for vertical development. Therefore, urban densification comes with a tradeoff between land-carbon effects and embodied emissions from buildings that should be taken into account in development of urbanization policy. Importantly, that same densification might lead to substantial avoided carbon emissions from more efficient operation and reduced transportation distances, but operational analysis was beyond the scope of this study.

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