(disclaimer - Like most people I have too big of a carbon footprint, and I am a consumer. I do strive to consume less and have a smaller foot print.)
At work we buy fiber cables on spools. the spools are made of wood. Other heavy items are shipped on wood pallets. Before someone uses them as firewood I try to claim them for rough useage.
Geoffrey taking a pallet apart. part of a spool set aside for some use.
Pallet was used for paneling on the metal door frame.