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Global Challenges
World at Risk
1. Global Hazards
The Disaster risk Equation
Hazards x Vulnerability
Capacity to cope
A natural phenomenon is a natural event. A natural hazard is a natural
event with the potential to harm people or
property. A natural disaster is a natural event that has damaged people or
property. In terms of the equation hazards refers to the frequency, severity
and
types. Vulnerability is how susceptible a population is to the damaged
caused by
a hazard.…read more

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C in order for them to form.
At this temperature the air is unstable and has the potential to rise.
(Exception: hurricanes not found off west coast of Africa, due to cold
Benguela ocean current.) Hurricanes derive their energy from the sea.
Rapidly, rising moist air
cools and condenses, releasing latent heat. This heat increases the power and
intensity. (Hurricanes loose their power and intensity without the moist oceanic
air.) Hurricanes are thought to be triggered by disturbances in the lower
atmosphere.…read more

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Inter tropical convergence zone (ITCZ). The ITCZ is formed by the convergence
of warm air at the surface, and characterised by a discontinuous area of low
pressure with associated thunderstorms. A hurricane is a spinning vortex of
rapidly rising air. This is due to the
coriolis effect, which is caused by the rotation of the earth about its axis. There
is no coriolis force at the equator, and it increases towards the poles.…read more

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Droughts can sometimes
lead to the secondary hazard of wildfires.
Floods
A flood is an overflow of water that submerges land that is normally not
covered by water.…read more

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