Ecological Footprint:The ecological footprint measures human demand on nature, i.e., the quantity of nature it takes to support people or an economy. It tracks this demand through an assessment of the biologically productive land and sea area required to produce the resources a human population consumes and to absorb its waste, given prevailing technology and resource management.
Sustainability: Sustainability refers to the ability to meet the needs of the present without compromising the ability of future generations to meet their own needs. It involves finding a balance between environmental, social, and economic considerations.
Carrying Capacity:The carrying capacity of a biological species in an environment is the maximum population size of the species that the environment can sustain indefinitely, given the food, habitat, water, and other necessities available in the environment.