I do not know if emigration can be attributed to climate change or not, but I do that that Israel produces very large quanties of fresh water by desalination:
https://en.wikipedia.org/wiki/Desalination#Israel
Neighboring countries may not be able to afford this.
The wholesale cost of desalinated water in Israel is quite cheap, about 50 cents for a cubic meter, which is significantly more than the average household uses.
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