Human migration patterns have been affected by climate change and the unpredictable events it brings about. But as humans are the most complex mammals, so are our migration patterns. Just as influential as the physical affection of drought, flood, landslide, soil erosion and other climatic disasters, are the social circumstances of the population in the affected area. Communities in less developed countries with little or no governing structure and unstable income are more likely to leave affected areas and not return. But when physical affection is severe enough the location become unlivable and social forces are no longer a factor in migratory decisions. Examples of such instances are Hurricane Katrina and the recent tsunami in Japan, events that may or may not have been influenced by climate change.
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