High-fibre composting (high carbon) is a system which has been developed and trialled at the Centre for Alternative Technology (CAT) in Wales with good results. It consists of adding all cardboard (including packaging, toilet roll tubes, cereal boxes), newspaper, magazines, etc. to the composting stream. Such material should be distributed thoroughly throughout the heap, and well stirred through (mixed) in order to increase its surface area and improve aeration in the heap.