A old wooden cupboard, but much greener than a modern one. Probably manufactured without much machinery. Transported to a shop on a horse and cart. The wood its made of must be 100 years old. It isn’t damaging rain forests now. Apparently an old chest of draws has a 16X smaller carbon footprint than its modern equivalent.
By buying old furniture which has stood the test of time you are recycling something that still had a use. I suppose if you don’t like brown furniture you could upcycle it… But that cupboard might just be worth something, so don’t sand it down and paint it if you aren’t sure of its provinance.