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Principles of Green Engineering

one Ensure that all materials and energy inputs and outputs are inherently non-hazardous.
two Prevent waste rather than treat / clean up waste.
three Separation and purification operations designed to minimize energy & materials use.
four Products, processes and systems designed to maximize mass, energy, space and time efficiency.
five Use catalysts, not stoichiometric reagents.
six Products, processes and systems should ‘output pulled’ rather than ‘input pushed’ through the use of energy and     materials.
seven Recycle.
eight Targeted durability, not immortality, should be a design goal.
nine Design for unnecessary capacity or capability solutions should be considered a design flaw.
ten Material diversity in multi component products should be minimized to promote disassembly and value retention.
eleven Design of products, processes and systems must include integration and interconnectivity with available energy and material flows.
twelve Products, processes & systems to be designed for performance in a commercial “afterlife”.
thirteen Material and energy inputs should be renewable rather than depleting.

Anastas, P.T., & Zimmerman, J.B., “Design through the 12 Principles of Green Engineering”, Env. Sci. & Tech., 37,5,95,101,2003.