"Tell me how much the infrastructure is going to cost us?"
A hell of a lot. That's why I said it wouldn't happen.
Submit it to some Soros-funded eco-hugging group and ask for seed money to flesh it out for a feasibility study. Spend a little, pay yourself an abundant salary, and employ some friends. Then declare that you didn't think it would work, but maybe someone else can years from now when technology catches up. Let that seed germinate within them for a while, and eventually someone else will study it again. And the icing on the cake is: it wastes money that could be used to forward other liberal causes. :)