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Those are some excellent points, thanks for sharing. There are also substantial technological barriers to high density farming. People often talk about vertical farming as a way to reduce the surface area needed for agriculture and to solve problems associated with shipping produce long distances. It's compelling theoretically, but as it turns out there are actually a lot of problems with trying to grow vegetables in a skyscraper. Perhaps as our technology increases we will be able to find more viable ways to increase agricultural density.