Air sustainability relates to the preservation of the climate and the ozone layer.
Water sustainability implies the use of surface water, which is completely renewable, and the judicious use of groundwater,
which may not be completely renewable.
Depletion of groundwater plagues societies in arid and semiarid regions.
Soil sustainability refers to the control of accelerated erosion.
Accelerated erosion is caused by unsustainable practices in animal husbandry [grazing], agriculture, or urban development.