From one of the authors:
"It should also remove SO₂ and chlorides from the atmosphere, and may reduce residence time of CFCs HFCs and PFCs. As far as I know, this is the only proposed alternative net-zero GHG fuel with aircraft range similar to or longer than plain hydrocarbons. (NH₃, H₂, even synthetic liquid CH₄ all have 55-90% lower energy density and require pressurization or cryogenic cooling.) The combustion product magnesia (~100 nm MgO particles) is a bodily nutrient which dissolves in lung fluids, we drink it for upset stomach and add it to drinking water to reduce acidity."