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— Ralph Merkle"Because of technological limits, there is a certain amount of food that we can produce per acre. If we were to have intensive greenhouse agriculture, we could have much higher production."
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The city of London, within the walls, occupies a space of only 370 acres, and is but the hundred and fortieth part of the extent covered by the whole metropolis
— Henry Mayhew
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It looks as though yields of over 10 times what we can currently grow per acre are feasible if you control the CO2 concentration, the humidity, the temperature, all the various factors that plants depend on to grow rapidly.
— Ralph Merkle
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