We dredge out the sea bed, and wash the salt our in estuaries. We then form this into soil mat, we distribute over the hgih lands in deserts.
We then apply just 1m of vacuum head to sea or river water. The water boils, losing all salts and contaminants. We do this is a conical tower, so the cold salty or brown water sinks, drawing in new salt water.
So we extract water vapour. We use solar panels, or little wind turbine: so we capture the on shore breeze. We charge batteries, or use mains to carry us through the night.
Giving e.g. Ethiopia these towers and solar pumps is cheaper and less fatal than coping with regular droughts and famines.
So we pump the water to the high area – and irrigate the new soil. Grass grows. And we plant trees in soil mounds, to stabilise the soil.
Gradualyl we turn the deserts BACK into lush farms. The growing plants gobble the cO2 from the air.
1 mCO2+(n+r)H2O+O2+L1+TU->(Cm(H2O)n-E)+r(He+O3+E2+L2) L2 is faint blue light, emitter by all plant. L1 is UV light. So we can illuminate plants with UV light in the dark.
They will glow faintly blue. Plants give out X-rays, and produce helium and free radical oxygen gas. Hence the ozone we get in the country side.
Which makes biology the world experts on nuclear fusion on earth. Passing H ions around a helix 'wil never do nuclear fusion' in the words of Dr Z – my PhD supervisor.
So all the extra plants will turn what is now deserts, back into lush rain forest. And gobble up all the CO2 they can get.
Nature today limits free CO2 at 2 parts per million – its pre-industrial level. Higher CO2 levels – nuclear induced science fiction. Biologically impossible.