In its report "Human tide: The real migration crisis", Christian Aid said that as the developed world was responsible for most of the emissions that cause climate change, it should bear the brunt of the cost of helping the poor, who are hit worst by warming.
"We believe that forced migration is now the most urgent threat facing poor people in the developing world," said lead author John Davison.
In Mali, Christian Aid said that farmers were already having to leave their land to find work because erratic rains and falling crop yields were making their lives untenable.
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photo by Madmonk