Embodied energy reveals the hidden ecological cost of materials, with aluminum requiring 200-220 MJ/kg compared to concrete’s 1-1.3 MJ/kg.
Use-phase efficiency through lightweight engineering can offset production energy costs, especially in mobile systems where fuel savings dominate life-cycle impact.
Circular economy strategies like service models and design for disassembly enable material recovery and reduce waste, transitioning from cradle-to-grave to cradle-to-cradle.
Material selection must balance mechanical performance with environmental impact, using indices like $E^{1/2}/(H_p\rho)$ to optimize for sustainability.
End-of-life strategies prioritize reuse over recycling, with service-based ownership creating incentives for longevity and recovery.
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