The assumptions underlying eco-footprinting

in essence, the concept of a person's ecological footprint is simple: it is the area of land needed to support permanently a specified lifestyle. But in practice eco-footprinting is more complex. it is the purpose of this paper to investigate the most important aspects of that complexity. We avoid discussion of a recent elaboration of eco-footprinting, namely including the sea as a component of the ecological footprint and the use of equivalence factors. The reason is that we see those changes as being less fundamental, and intend to cover them in a separate paper. The current paper-concentrating on the fundamentals-concludes that eco-footprinting is the best method available for making a quantitative assessment of the extent to which consumption, by a specified human population, is exceeding biocapacity.