"Can genetic engineers restore a rapid worldwide rise in grainland productivity? This prospect is not promising simply because plant breeders using traditional techniques have largely exploited the genetic potential for increasing the share of photosynthate that goes into seed. Once this is pushed close to its limit, the remaining options tend to be relatively small, clustering around efforts to raise the plant’s tolerance of various stresses, such as drought or soil salinity. One major option left to scientists is to increase the efficiency of the process of photosynthesis itself—something that has thus far remained beyond their reach."
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Lester R. Brown, Outgrowing the Earth (2005), Ch. 4 : Raising the Earth’s Productivity
https://en.wikiquote.org/wiki/Genetic_engineering
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Genetic engineering
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