Reliable statistical data cannot be collected as there is not an internationally recognised definition for the phenomenon of climate-induced migration. In addition, estimates are also hindered by the fact that an immediate connection between the consequences of climate change and migration cannot be clearly demonstrated.
Estimates
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In the absence of authoritative forecasts, there is a series of estimates based on unsupported assumptions (so-called guesstimates). The figures vary depending on which climatic, demographic and social values the estimates are based on. Under favourable conditions, there may be only a slight increase in current migratory movements, but under unfavourable conditions even high estimates appear to be too low.
In 2002 the UNHCR estimated the number of people forced into migration as a result of flooding, famine and other environmental factors at 24 million
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