Definitions

Core and Periphery
The concept of a developed core surrounded by an undeveloped
periphery. The concept can be applied at various scales.
Ecological footprint
The theoretical measurement of the amount of land and water a
population requires to produce the resources it consumes and to absorb
its waste under prevailing technology.
Global Climate Change
The changes in global patterns of rainfall and temperature, sea level,
habitats and the incidences of droughts, floods and storms, resulting
from changes in the Earth’s atmosphere, believed to be mainly caused
by the enhanced greenhouse effect.
GNI
Gross national income (now used in preference to gross national
product—GNP). The total value of goods and services produced within
a country together with the balance of income and payments from or to
other countries.
Migration
The movement of people, involving a change of residence. It can be
internal or external (international) and voluntary or forced. It does not
include temporary circulations such as commuting or tourism.
Remittances
Transfers of money/goods by foreign workers to their home countries.
Soil Degradation
A severe reduction in the quality of soils. The term includes soil erosion,
salinization and soil exhaustion (loss of fertility).
Physical Water Scarcity
physical water scarcity, where water resource development is
approaching or has exceeded unsustainable levels; it relates water
availability to water demand and implies that arid areas are not
necessarily water scarce
Economic Water Scarcity
economic water scarcity, where water is available locally but not
accessible for human, institutional or financial capital reasons.

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