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Construction and demolition (C&D) waste constitutes a substantial portion of urban material flows, contributing significantly to greenhouse gas emissions and resource depletion. This study considers a Sustainable Systems EngineeringSystems engineering approach to examine C&D waste in Boulder, Colorado. We estimate a material flow analysisMaterial flow analysis to the existing buildings in Boulder, Colorado, USA by using a Regional Assessment of Material IntensityMaterial intensity (RASMI) to determine the material composition, a CBEIConsumption-Based Emissions Inventory (CBEI) calculator to determine the embodied carbon, then use Boulder’s current 80% diversion rate to estimate C&D material flow. Our results show that concrete and masonry are Boulder’s largest building material stock by mass, followed by wood and steel. We compare our material analysis to the Colorado End Market Assessment and JUST2CE’s scenarios to inform deconstructionDeconstruction policy. Scenario analysis underscores the utility of government intervention through financial investment and policy. This research provides insights for municipalities seeking to enhance circular economyCircular economy outcomes, demonstrating that Systems Approaches through MFA and CBEIConsumption-Based Emissions Inventory (CBEI) are powerful tools for identifying leverage points in C&D waste managementWaste management and for advancing Sustainable Development Goals 11 and 12.

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Applying Sustainable Systems Material Flow Analysis to Achieve Targets for SDGs 11 and 12

  • 会议论文

  • 发表日期：

    2026年

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  • Catherine E. Bond,
  • Steven Conrad,
  • John Killingsworth

摘要

Construction and demolition (C&D) waste constitutes a substantial portion of urban material flows, contributing significantly to greenhouse gas emissions and resource depletion. This study considers a Sustainable Systems EngineeringSystems engineering approach to examine C&D waste in Boulder, Colorado. We estimate a material flow analysisMaterial flow analysis to the existing buildings in Boulder, Colorado, USA by using a Regional Assessment of Material IntensityMaterial intensity (RASMI) to determine the material composition, a CBEIConsumption-Based Emissions Inventory (CBEI) calculator to determine the embodied carbon, then use Boulder’s current 80% diversion rate to estimate C&D material flow. Our results show that concrete and masonry are Boulder’s largest building material stock by mass, followed by wood and steel. We compare our material analysis to the Colorado End Market Assessment and JUST2CE’s scenarios to inform deconstructionDeconstruction policy. Scenario analysis underscores the utility of government intervention through financial investment and policy. This research provides insights for municipalities seeking to enhance circular economyCircular economy outcomes, demonstrating that Systems Approaches through MFA and CBEIConsumption-Based Emissions Inventory (CBEI) are powerful tools for identifying leverage points in C&D waste managementWaste management and for advancing Sustainable Development Goals 11 and 12.