<![CDATA[Background: Green engineering becomes credible when environmental gains can be traced through the design and operation of a process. The most useful projects are often not dramatic technology substitutions but disciplined changes in energy use, material flow, maintenance and equipment selection. Aims: This article examines the mechanisms that connect the topic to organizational or policy performance and identifies the conditions that make those mechanisms stronger or weaker. Research Method: A structured narrative review integrates peer-reviewed research with authoritative policy, statistical, and professional sources, including UNCTAD (2025); IEA (2024a). Sources are coded by outcome, mechanism, boundary condition, and practical implication. Results and Conclusion: The synthesis indicates that outcomes are heterogeneous. Cost and sustainability are not always aligned in the short run. Some investments reduce operating cost quickly, while others require longer payback periods or depend on infrastructure and regulation that a single plant cannot control. Six recurring themes show that implementation quality, information, capability, and institutional context frequently matter as much as the headline policy or technology. Contribution: The article offers an evidence-based framework for industrial plants and engineering teams that translates the literature into decision principles without claiming primary data that were not collected.]]>
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