>the energy embodied in aluminum See here: https://en.wikipedia.org/wiki/Embodied_energy https://en.wikipedia.org/wiki/Embodied_energy >the rate at which that

>the energy embodied in aluminum See here: https://en.wikipedia.org/wiki/Embodied_energy https://en.wikipedia.org/wiki/Embodied_energy >the rate at which that carpet you specified off-gasses I think the general idea behind this one is know that the materials you select can have an adverse effect on those who have to live with them. Carpet is one example to illustrate the point