Rooftop farms and greenhouses can be very expensive. Freight Farms repurposes shipping containers as hydroponic gardens using LED lights. It may be viable for high value greens that need to be fresh - think restaurants and high end consumers.
Starting around 1915 and lasting into the early 1920s, a US Post Office-backed “Farm to Table” movement encouraged consumers to have farmers ship them fresh food via parcel post. Its goals were to lower food costs while aiding farmers. In November of 1919, the B. F. Goodrich company supported a Farm to Table week in which consumers were to drive to rural areas to buy provisions from farmers. At least one restaurant which ran a farm, Kolb’s in New Orleans, adopted the slogan. In the late 1920s the Miami FL chamber of commerce encouraged restaurants to buy local, arguing that it was not only healthy to serve more fruits and vegetables but good for farmers and the Dade County economy.
If you've ever tried licking the terminals of a 9 volt battery, it is likely you found a tingling sensation and a bitter metallic taste. It turns out researchers have looked at electrical taste stimulation. After viewing this video I looked at a few papers, but didn't see anything like Hiromi Nakamura's fork. I couldn't find any papers by her on this, but if it works as shown it might be very useful for playing with food and even making it possible to cut salt intake. In any event I suspect a lot of people are trying this now.