At a World Council of Churches conference last year on the French-Swiss border, much was made of the “likelihood of mass population displacement” driven by climate change and the mass migration of people fleeing zones inundated by rising seas. While the WCC acknowledged that “there are no solid estimates” about the likely numbers of what it called climate refugees, that didn’t stop assembled experts from throwing out some guesses: 20 million, hundreds of millions, or 1 billion people.
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