As Urbanization Week continues, Liz Borkowski put up a great post about feeding cities that includes a nice, rational discussion of the idea of Vertical Farming. I’m glad to see the issue come up, because it has so much power. We have a strong taste for complex and expensive, especially when it looks cool – generally speaking, and in an era of cheap energy and economic stability, there’s at least an argument for doing the complicated fancy thing – first, you can, second, the results are more elegant than what you can generally get without complexity. But in a society with major economic constraints and facing the reality of less, rather than more available energy for consumption, complex and expensive becomes not only a bad idea, but infeasible.