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c) The Ecological Footprint tracks the use of six categories of productive surface areas: cropland, grazing land, fishing grounds, built-up land, forest area, and carbon demand on land.
d) Both the Ecological Footprint and biocapacity are expressed in global hectares—globally comparable, standardized hectares with world average productivity.
b) On the demand side, the Ecological Footprint measures the ecological assets that a given population requires to produce the natural resources it consumes and to absorb its waste, especially carbon emissions.
e) On the supply side, a city, state or nation’s biocapacity represents the productivity of its ecological assets. These areas, especially if left unharvested, can also absorb much of the waste we generate, especially our carbon emissions.
a) Ecological Footprint accounting measures the demand on and supply of nature.