ter sources found below the surface of the earth often
in naturally occurring reservoirs in permeable rock strata; the source
for wells and natural springs.

Highlands Water Project - a series of dams constructed jointly by
Lesotho and South Africa to redirect Lesotho's abundant water supply
into a rapidly growing area in South Africa; while it is the largest
infrastructure project in southern Africa, it is also the most costly
and controversial; objections to the project include claims that it
forces people from their homes, submerges farmlands, and squanders
economic resources.

Inuit Circumpolar Conference (ICC) - represents the 145,000 Inuits of
Russia, Alaska, Canada, and Greenland in international environmental
issues; a General Assembly convenes every three years to determine the
focus of the ICC; the most current concerns are long-range transport of
pollutants, sustainable development, and climate change.

Metallurgical plants - industries which specialize in the science,
technology, and processing of metals; these plants produce highly
concentrated and toxic wastes which can contribute to pollution of
ground water and air when not properly disposed.

Noxious substances - injurious, very harmful to living beings.
Overgrazing - the grazing of animals on plant material faster than it
can naturally regrow leading to the permanent loss of plant cover, a
common effect of too many animals grazing limited range land.

Ozone shield - a layer of the atmosphere composed of ozone gas (O3)
that resides approximately 25 miles above the Earth's surface and
absorbs solar ultraviolet radiation that can be harmful to living
organisms.

Poaching - the illegal killing of animals or fish, a great concern with
respect to endangered or threatened species.

Pollution - the contamination of a healthy environment by man-made
waste.

Potable water - water that is drinkable, safe to be consumed.

Salination - the process through which fresh (drinkable) water becomes
salt (undrinkable) water; hence, desalination is the reverse process;
also involves the accumulation of salts in topsoil caused by
evaporation of excessive irrigation water, a process that can
eventually render soil incapable of supporting crops.

Siltation - occurs when water channels and reservoirs become clotted
with silt and mud, a side effect of deforestation and soil erosion.

Slash-and-burn agriculture - a rotating cultivation technique in which
trees are