Thanks for the responses..
Matt, with regards to recycling, I meant it to read that some of the equipment was being manufactured "green" or from recycled plastic/metal/paper etc, rather than the family re-used from one project to another.
Regarding missing data (question 4) I guess this could mean the amount of recycleable material in each product, so if I were modelling a building that the client wanted to be deemed "green" it would be easy to find that kind of information out.
As I tend to mainly use the column and beam libraries supplied on the very odd times I use Revit, this is all new information to me.
Again, thanks for everyones time.