Re: waste
My cousin was promoted within the UK Inland Revenue department. In his new office was a locked steel 6 foot cabinet with no key available. Locksmiths opened the cabinet and it was found to be crammed full of envelopes and those gummed re-use labels all marked "On His Majesty's Service". As this was in the 1970s my cousin decided it probably wasn't worth hanging on to them "just in case"...
My cousin also discovered that those gummed re-use labels actually cost more than 2 or 3 envelopes