21st century Urban Farming

Whilst Hydroponics is probably 1,400 years old, the latest versions using LED strip lights and the latest mixes of colour in the lighting so as to allow crops to be grown on racks in caves or in shipping containers, or up the sides of buildings are perhaps 4 years or so old.
Part of the latest new wave of green technology – urban farming, ground-source heat pumping and cross laminated timber construction.
New projects are underway such as in the mines of South Wales or a cave beneath the Galleries of Justice where mushrooms are set to be grown using coffee grounds as the soil.
Are we on the verge of a new kind of urban farming, were lettuces are grown within 25 days at low cost, using workers who tour the small locations in caves or containers? Can this kind of farming be delivered commercially outside of there testing grounds of state controlled experiments in China?
Perhaps time to find out.

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