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4. Change of external conditions. We now return to the default weightings of 25%.

Consider now that the double-glazing unit is located in a very cold climate?

Would this have an effect on your preferred design choice from Q2?

5. Final stage: MANUFACTURE. The DG unit consists of a window-shaped box with rubber seals to prevent the exchange of gas between the filler space and atmosphere and, spacers to keep the glass panes square. Testing of a new rubber and spacers would suggest that if the space between the glass panes can be reduced to 5 mm or less, then the lifetime might be extended to 30 or more years. It is not clear whether this new sealing design can be patented, in effect restricting use to the manufacturer or by licensing to other manufacturers.

(i) Would this design suggestion dictated by manufacturing affect your choice of preferred design choice from Q2?

(ii) A concern from the finance director is that with this paradigm shift in sealing design, and double-glazing units lasting for 10 years longer, these factors might affect the long-term viability of double-glazing manufacturers and it may be wiser to continue manufacturing based on the current sealing design.

What is your advice based on the advice from an ethical code of practice?

6. It is suggested that one way of mitigating the effects of carbon dioxide in the atmosphere would be to use carbon dioxide as a filler gas, particularly in situations where the value of x_gas is large and the pressure can be increased.

The marketing approach might be on the basis of the following statements:

M1. The overall effect would be to reduce the amount of carbon dioxide in the atmosphere and would be a preferable alternative to sequestration in underground caverns. Considering the number of double-glazing units produced each year, the amount that could be stored would be significant.

M2. Although the overall performance might not be as good as other gases, this might be a price worth paying and might form the basis of green double glazing akin to ethical investments where the financial returns might not be as great as for standard investments.

Comment on M1 and M2, from the perspective of an ethical code of practice. What would be your advice to the marketing department?