The only way it would be comparable to CA flown in lettuce is the greenhouse/vertical farms are fully automated and there is a super short supply chain and abso

The only way it would be comparable to CA flown in lettuce is the greenhouse/vertical farms are fully automated and there is a super short supply chain and absolutely no wastage. This can be achieved by supplying to local markets which would shorten supply chain. But the scale would have to be massive to make a buck out of this. Automated greenhouses must also look into growing underground. In tunnels beneath or near water treatment plants or anywhere where there is steam. Further, energy will always be an issue. There are two ways to go about it. Cheap electricity by going nuclear. Or advances in material sciences to develop new kinds of indoor lights/batteries or greenhouse material that can help with light/heat/thermal insulation.(one company is doing it with quantum/nano dots as greenhouse material. ETFE can be a better material than greenhouse plastic or glasshouses)