To become much more self-sufficient, the UK would need to drastically reduce its consumption of animal foods, and probably also farm more intensively — meaning fewer green fields, and more factory-style production.
So now assuming that we have gathered everybody together in the same place to create our city, let's look at some real life examples to see what living so close together might actually look like.
Hospitals are dense gatherings of sick people with weakened immune systems and various wounds and punctures, constantly poked and prodded by fingers and tools that move around the hospital to poke and prod others.
The potentially explosive first days of school will be a challenge for teachers - and for parents, too, in coping with the emotional and behavioral spillover at home.