High School physics. We apply a 1m vacuum to sea water, and it boils off – losing all salts and contaminants.
So we buy a 10W solar power vacuum pump, and during the day fill a holding reservoir 6m above the sea. We use other solar pumps, to distribute the water inshore.
We use the same idea, to turn brown river water, into pure desalinated water – great for agriculture.
We dredge up sea bed, wash it in estuary water – to remove most of the salt. We then use this to build new arable land. Seeded with grass seed – we turn desert into lush savannah – ideal for grazing sheep.
All the extra plant growth sucks in CO2,SO2 and NO2– but natural photosynthesis on land and sea already caps free CO2 at just 2 parts per million.
NO2 is capped at 4 parts per billion. So petrol and diesel vehicles drive around, spraying plant fertilizer into the air. Diesels – the green machines.
1 C12H26+pO2->12CO2+(26-r)(H2O-E)+r(He+O+E2+X-ray) https://www.afdc.energy.gov/pdfs/comb_reportnew.pdf
That's right, diesel engines do Molecular Nuclear Fusion.