1. Recycle content. The aluminum-glass table of the previous question is, in fact, made from aluminum with a typical recycled content. How much difference does this make to its embodied energy? 2....

1. Recycle content. The aluminum-glass table of the previous question is, in fact, made from aluminum with a typical recycled content. How much difference does this make to its embodied energy?

2. Process energies. A cast-iron cistern cover is cast to its initial shape and then rough-machined to its final shape, removing 5% of its mass. If the initial casting weighed 16 kg, what, approximately, is the carbon footprint associated with the material and the processing of the cover? Which step contributes the most? Table 6.5(b) and the data sheet for cast iron of Chapter 15 have the necessary data.