"By the year 2050, nearly 80% of the earth’s population will reside in urban centres. The human population will increase by about 3 billion people during the interim. If we don’t learn how to [vertical farm] soon, these will become horrible places."
According the UN, the amount of arable land per person decreased from about an acre in 1970 to roughly half an acre in 2000 and is projected to decline to about a third of an acre by 2050.
There will simply not be enough farmland to feed us.
Vertical farming also uses a fraction of the water land farming does. Countries that are "water challenged" will implement this type of farming in the near future says most scientists.
Click on this to read more about The High Rise Urban Farms of the Future.
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Vertical farming is really a joke proposal. It would require massive amounts of energy to build a vertical farm, and even the daily operation would use more energy than you would save from transporting food shorter distances. This means a vertical farm would generate large amount of net carbon and contribute to global warming. It would also be much less resilient in the face of energy shortages or peak oil. However, that's not to say that growing more food in urban areas isn't a good idea. Growing food on lawns and building community gardens are both great idea.
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