Ecological footprint analysis

The Ecological Footprint Analysis (EFA) concept was developed by Mathis Wackernagel and William E. Rees in 1996 to represent the natural resource consumption associated with human activity. Ecological footprint analysis compares human demands on nature with the biosphere's ability to regenerate resources and provide services. It does this by assessing the biologically productive land and marine area required to produce the resources a population consumes and absorb the corresponding waste, using prevailing technology. Footprint values at the end of a survey are categorized for Carbon, Food, Housing, and Goods and Services as well as the total footprint number of Earths needed to sustain the world's population at that level of consumption. This approach can also be applied to an activity such as the manufacturing of a product or driving of a car. The strength of the EFA is that it communicates degrees and patterns of consumption simply and clearly. The EFA has its limitations. It is a static measurement, representing the consumption of an entity at one particular point in time. More importantly, the only way to reduce the size of a footprint is to acquire more land, decrease the population, or more realistically and appropriately, reduce the amount of goods and services that each person consumes. Overall, the EFA is a conservative measure of resource consumption since any practice considered by its nature not sustainable (e.g., toxic waste production and assimilation) is not included in its calculations, despite its detrimental effect on natural resources.