It would be cheaper and more practical to talk about space-based sunshields, and that’s about as practical as prayer. At the altitudes any realistic glider can reach you’d have to use sulfur aerosols and not ice, and in either case you’d need to inject gigatons per year, every year because at that altitude aerosols are very short-lived.

A realistic aircraft capable of those payloads will burn avgas, no solar craft comes close to the capability. The side effects such as a significant increase in acid rain, are not trivial either.

These are fantasies of people who cannot accept the reality of what we’re facing.