Water shortages tend to be regional issues. That is why while there are virtually no water shortages ever (generally, baring terrible unforseen droughts) in wealthy countries such as the U.S and E.U. countries, while poorer countries in hotter regions tend to have chronic water problems.
The issue is that clean water cannot be transported at low costs from places where it is abundant to places where it is scarce. In addition, there is technology to turn dirty water to clean drinkng water (desalination). However this technology is relatively new and expensive, therefore poorer countries who have serious water shortages cannot afford this technology on a large enough scale to make it an effective sollution.
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