Exercises using the CES eco-audit tool

E.7.11. Repeat the analysis of the PET bottle for the Alpure water case, the first case study in the chapter,

entering data from Table 7.1 using the CES eco-audit tool. Then repeat, replacing the PET bottle by a glass one, using the additional information in Exercise E.7.2.

E.7.12. Carry out the eco-audit for the PP electric kettle of Section 7.3, now using the fact that the kettle body and the cardboard packaging are recycled at end of life.

E.7.13. Carry out the eco-audit for the coffeemaker of Section 7.4, now using the fact that it is made entirely out of recycled materials (tick the box "100% recycled").

E.7.14. Carry out the eco-audit for the portable space heater using the data from Section 7.5, assuming that at end of first life, the fan and heat shield are re-engineered to incorporate them into a new product.

E.7.15. Carry out Exercise E.7.5 (the toaster) using the CES eco-audit tool and the bill of materials listed there. Make bar charts for both energy and CO2. Then tick the box "standard grade" in the calculation, and repeat. Compare the result with using virgin material for making the toaster. "Standard grade" means that the materials contain the typi­cal recycle fraction listed in the data sheets of Chapter 12.

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■ Decide on the ranking criterion you will use to decide which, of the candidate things that meet all the constraints, is the best; choose and apply the objective.

■ Research the top-ranked candidates more fully to satisfy yourself that nothing has been overlooked; seek documentation.

This chapter is about selection using this strategy. It is simpler to start with a product than with a material; the ideas are the same, but the material has added complications. So we start with cars, basing the discussion around the selection of a car to meet given constraints and with two objectives, one of them that of minimizing carbon footprint. Selecting materials uses the same reasoning and method. The rest of the chapter describes how to do it.