<![CDATA[Background: Green investment can reduce waste and energy intensity, but returns depend on process redesign, utilization, maintenance, workforce skills, and the quality of investment appraisal. Aim: The current analysis explains how the relationship between the focal practices and operational efficiency operates in regional manufacturing firms evaluating energy-efficient equipment, cleaner production, monitoring systems, and circular-resource practices. Method: A structured narrative review integrates peer-reviewed research and authoritative institutional sources. Published findings is coded by mechanism, boundary condition, practice development risk, and practical implication. Results: The synthesis identifies six linked mechanisms: energy and material productivity, life-cycle investment appraisal, process integration, maintenance capability, supplier and worker participation, measurement of environmental and operating outcomes. The synthesis indicates that outcomes depend less on nominal adoption than on practice development quality, governance, learning, and fit with local capacity. Conclusion: Decision makers should define the expected outcome, assign responsibility, establish a small set of auditable indicators, and revise the intervention when published findings contradicts its assumptions. Contribution: The synthesis provides a conditional framework without claiming primary data that were not collected.]]>
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