Vertical farming has been a perennial favorite of "futurists" much like flying cars. Unlike flying cars, the technology itself is fully proven and has been for

Vertical farming has been a perennial favorite of "futurists" much like flying cars. Unlike flying cars, the technology itself is fully proven and has been for a long time. The reason why it isn't common is due to economic factors, not so much technology. Urban land is a very expensive speculative commodity and under-used, because there's little penalty for doing nothing with it, thus causing sprawl. Simultaneously, we subsidize transportation, so we encourage sprawl in lots of senses... including in an agricultural sense. The wear and tear on highways is almost entirely from trucking, but we all pay equally for it. Cultured meat, however, is something that I am very hopeful about. I'd be thrilled if we achieved it by 2030, but that seems overly optimistic. I'd love to be proven wrong, however... the sooner the better.