That's an interesting article. I wonder how practical would it be to harvest hydrogen (protons, really) from solar wind using magnetic lensing. Tha same tech could be useful for Mars.

Depending on the shape of the parasol, the same support structures could be used for the lenses, focusing a stream of hydrogen nuclei on a small area of the planet. This focused plasma stream could also compensate some of the forces on the parasol (it'd need to be closer to the Sun than the Sun/Venus L1 point and balanced by light pressure) allowing the parasol to be smaller.