住宅ストックの進化と惑星限界：絶対的持続可能性に向けた転換管理を可能にするセクターの社会代謝・排出軌道の予測
Housing stock evolution and planetary boundaries: Forecasting the sector's socio-metabolic and emissions trajectory to enable transition management toward absolute sustainability (原題)
Gerasimos Christoforatos, Γεώργιος Μάνθος, Kim Louise Pickering
🤖 gxceed AI 要約
日本語
ニュージーランドの住宅セクターを対象に、35年分の建築確認データと3つの建築類型を用いてストックの社会代謝と排出軌道を予測した研究。2029年までにタウンハウスが戸建てを確認件数で上回る一方、延床面積では戸建てが優勢と予測。セクターの埋込排出は炭素の惑星限界を現状7.5倍、2029年には8.6倍超過する見通しで、最良類型でも一人当たり11.9t-CO2eqと絶対的持続可能性の上限1.7tを大きく上回る。技術効率や富裕さだけでは絶対的持続可能性に到達できず、複合的な介入や代替住宅システムの探求が必要と結論づける。
English
Using 35 years of building consent data across three typologies, this study maps New Zealand's housing stock evolution, forecasts its trajectory to 2029, and benchmarks embodied emissions against planetary boundaries. Townhouses are projected to surpass detached housing in consented dwellings while detached homes still dominate floor area; the sector's embodied emissions currently exceed its carbon boundary 7.5-fold, rising to 8.6-fold by 2029. Even the best-performing typology requires 11.9 t CO2-eq per capita versus a 1.7 t absolute sustainability limit, implying that efficiency or sufficiency alone cannot deliver absolute sustainability.
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
日本の住宅セクターでも省エネ基準・ZEH・LCCMなど建物単体の対策が中心だが、本論文はストック全体の物質代謝と埋込排出を惑星限界で評価する枠組みを提示する。住宅・建設業のScope 3や長期脱炭素戦略を検討する日本企業・自治体にとって、絶対的持続可能性のベンチマーク手法として参考になる。
In the global GX context
The paper pushes beyond building-level mitigation to stock-level socio-metabolic accounting benchmarked against planetary boundaries, a framing relevant to CSRD/ISSB Scope 3 building emissions and transition planning. It offers a template for assessing whether construction trajectories are compatible with absolute sustainability limits, complementing TCFD-style disclosure with science-based sectoral boundaries.
👥 読者別の含意
🔬研究者:建物単体ではなく住宅ストック全体の物質代謝と惑星限界を結びつける予測・評価枠組みの実証例として参照できる。
🏢実務担当者:建設・不動産企業がScope 3埋込排出や長期脱炭素目標を絶対的持続可能性の観点で再検討する際のベンチマーク手法として活用できる。
🏛政策担当者:住宅政策・建築規制が惑星限界と整合するか評価するため、ストック全体の排出軌道を政策目標に組み込む必要性を示唆する。
📄 Abstract（原文）
Housing stock growth is essential for accommodating population growth while threatening planetary sustainability. Mitigation literature focuses on building-level innovations, while a broader perspective is needed to assess the stock's efficiency in delivering housing services within ecological limits. This research proposes an interdisciplinary framework encompassing socio-metabolic research, advanced forecasting, and absolute sustainability. Applied to New Zealand's residential sector, we utilize 35 years of building consent data across three building typologies to map the stock's evolution, forecast its trajectory, and benchmark embodied emissions against planetary boundaries. Retrospective analysis indicates post-COVID-19 stabilization, following unprecedented sector growth, steady densification since the 2008 Global Financial Crisis and 2016 zoning reforms, and a potential decline in construction quality since 2020. Forecasts through 2029 suggest townhouses will surpass detached housing in consented dwellings, while the latter continue to dominate consented gross floor area. During this period, the sector is anticipated to consume 14 Mt of building materials and emit 8 Mt of embodied emissions, currently exceeding its carbon planetary boundary by a factor of 7.5, while projected to reach 8.6 by 2029. Finally, typologies are assessed as provisioning systems highlighting townhouses' marginal superiority in affordability and environmental efficiency. Nevertheless, even the best-performing typology was found to require 11.9 t CO 2 -eq per capita, significantly exceeding the 1.7 t CO 2 -eq absolute sustainability limit. The findings indicate that neither technological efficiency nor affluence sufficiency alone can guide the sector toward absolute sustainability, highlighting the urgent need for combined interventions or exploration of alternative housing systems beyond traditional urban paradigms.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.spc.2026.10.016first seen 2026-11-13 04:56:05
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