Oh I see - things that cannot be grown outside in our climate.
The US currently imports more vegetables from Canada than it exports. The vegetables that come from canada are all grown in greenhouses. the vegetables that are grown in Mexico often come from farms that are watered from sewage plants.
vegetables that are grown indoors don’t need herbicides and pesticides. they are not subject to the whims of the weather. we’re basically talking about another agricultural revolution on the scale the tractors and railroads that opened up the farms of the midwest in the 1920’s.