Definitions of
disaster on the Web:
A disaster is a
natural or man-made event that negatively affects life, property, livelihood
or industry often resulting in permanent changes to human societies,
ecosystems and environment.
An unforeseen and
often sudden event that causes great damage, destruction and human suffering.
Though often caused by nature, disasters can have human origins. Wars
and civil disturbances that destroy homelands and displace people are
included among the causes of disasters. Other causes can be: building
collapse, blizzard, drought, epidemic, earthquake, explosion, fire,
flood, hazardous material or transportation incident (such as a chemical
spill), hurricane, nuclear incident, tornado, or volcano.