While not without its caveats, this site extols the virtues of vertical farming as one solution to food security. Syracuse, for example, does not have the requisite density to sustain a vertical farm - nor is it beneficial due to the areas of underutilized land both in/outside the city; however, there are many interesting projects and strategies presented under the "projects" section of the site.
See also the Interview with Steven Colbert - who interestingly enough asks poignant (if comedic) questions on the issue.
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