Signatures

My workplace is tied to environment protection and such and I've been wondering now for a while now, how much resources are wasted on processing e-mail signatures? We have a policy to have all kinds of crap in the signature, about 25-30 lines... sigh, fortunately nobdy enforces it so my signature is a whopping 2 lines, but I digress.
Anyway, many thousands (millions?) of servers need to process e-mail all the time, checking for spam and filter to folders and so on. So if the body of the mail is 1-2 lines and the rest is just baggage, how much energy is now wasted just to move the useless signature around ? One e-mail may not be much, but when you think about how much e-mail is transferred all the time and going to many routers and servers. It must add up to quite a lot don't you think?