Try building a solar farm(s) tall enough that shaded villages may be built beneath them...
Use solar energy to pump sea, or polluted water to the top of a tower of filters;
Let gravity cause the water to pass through filters, and spiral turbines;
Take nearly potable water to an electrolysis vat;
Capture hydrogen for fuel cell generated electricity;
Capture oxygen for waste water treatment;
Electrolysis leaves micro and nano plastics at the bottom of the vat; etc...
Just a few suggestions.
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