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The weather and climate is the most important factor in migration, ahead of even income and political freedom.
Research here in New Zealand has found, for the first time, that the effects of climate change are not only driving people to move country but its actually the number one reason.
Otago University economics researcher Dr Dennis Wesselbaum crunched the numbers of international migration figures to come to this conclusion.
The aftermath of Hurricane Maria in Puerto Rico Photo: AFP / File