For the past year or so, a tiny scale farming experiment in has been carried out in the desert field of Qatar, using only sunlight and seawater. From the article: 'A pilot plant built by the Sahara Forest Project (SFP) produced 75 kilograms of vegetables per square meter in three crops annually (or 25 kilograms per square meter, per crop)' If the yield level can be maintained, a farm of the size of 60 hectares would be enough to supply the nation of Qatar with all the cucumbers, tomatoes, peppers, and egglants that it needs. 'The project will proceed to the next stage with an expansion to 20 hectares, to test its viability into commercial operation.'
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