If one is to create useful compost, it is imperative that one is discerning about the materials that are composted and separating them out. If one simply uses any material that is capable of being composted or biodegraded, one ends up with something dangerous. I am thinking particularly of cooked foods, which are often mistakenly put into kitchen composters. That is probably the most common example. I wonder how the definitions will help to inform a strategy that, in turn, will help to inform a wider public about how we ensure that what we compost serves a useful purpose, rather than simply becoming problematic.