We will need to dematerialize our currently unsustainable consumption of more than one world down to a goal of one, or less than one world for a population that will be expanding by at least two billion people in the coming decades. Dematerialization in the developed north presents very different challenges from that of dematerialization in the less developed and less affluent global south. Context for dematerialization is one of the most important aspects of this effort toward sustainability, enabling projection of resource needs, and determining how we should dematerialize.