I'm going to have to read The Green North a second time before I post something, because I finished it, and I don't remember a page -- or a paragraph, or a line -- where he says why. Why do we have to build cities in the Green North? I understand that it won't be as awful as straw men might imagine -- greenhouses, telephones, regional theatre, warm clothes, Siberia does it -- but why?
I must have missed that part. So I'm going back.