world at risk definitions
- Created by: Emily BIrch
- Created on: 11-05-13 15:31
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- definitions
- greenhouse gases
- the gases which are said to retain heat within the earths atmosphere and contribute to global warming
- natural hazard
- is a natural event or process which affects people e.g loss of life, economic damage, disruption to peoples lives or environmental degradation
- hazard vulnerability
- is the capacity of a person or group to anticipate, cope with, and recover from the impact of a natural hazard
- storm surges
- occur when tides are highest
- enhanced greenhouse effect
- the increase in the natural greenhouse effect, said to be caused by human activities which increase the quantity of greenhouse gases in the atmosphere
- thermohaline circulation
- the flow of warm and cold water that circulates around the worlds oceans
- albedo
- is the amount of solar radiation reflected by the earths surfaces. ice and snow reflect most, dark rock surfaces reflect the least.
- tipping point
- to a point beyond which the earth cannot recover from the effects of carbon emissions, even with drastic action
- Carbon sequestration
- is where natural processes , such as plant respiration, are used to offset carbon emissions. trees absorb CO2 and give out oxygen, thus removing greenhouse gasses from the atmosphere.
- Delta
- is the area of sediment deposited where a river enters the sea or a lake
- the debt crisis
- where many African countries have become so heavily indebted that repayments sometimes exceed their GNP
- cash crops
- crops that are sold for income rather than own food supply
- desertification
- the way in which climate change and over-grazing turn previous fertile land into desert
- food security
- is the extent to which a country can rely upon food supplies.
- greenhouse gases
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