That's a really neat idea which I'm fond of, and it would certainly help with things like exploring other planets! Sadly, I've looked into it extensively, and

That's a really neat idea which I'm fond of, and it would certainly help with things like exploring other planets! Sadly, I've looked into it extensively, and the costs are way too high in comparison with outdoor farming. There are a few niche scenarios where you can get it to work, but they have to be priced at the high end. Things would need to get horrifically bad with the climate before the equation would change much. Indoor farming also couldn't be done at nearly the same volume, and expanding capacity would be very slow. I'm optimistic that in the long run, we'll find sources of nourishment which can be grown quickly in compact, easily managed closed-loop environments with minimal inputs... however, after the disillusionment of trying to find progress toward this end the real world, all I can say is we need a LOT more people working on it.