Science: Bountiful Algae

Half of the protein to feed the world's population could be raised on an area not much bigger than Rhode Island. So says the Carnegie Institution, in a report on the possibility of extracting foodstuffs from algae. The protein would be produced by growing one-celled algae (closely related to the green scum that forms on stagnant ponds) in "farms" resembling chemical factories, which may some day provide mankind with almost unlimited food.

Conventional crop plants, says the report, have many shortcomings. The food they produce by the action of sunlight is formed in their leaves, which are usually inedible and must be...

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