It has to be noted, however, that there is a large degree of uncertainty around numbers available for the biocapacity on the global scale. In addition, the biocapacity varies each year with ecosystem management, agricultural practices, ecosystem degradation, and weather, and population size. Thus, the biocapacity for a particular country or region may differ considerably from theglobal average available biocapacity. Nevertheless, the ecological footprint is a useful indicator for the potential impact of a megacity on its environment.
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