This is really impossible to know for sure. Typically GM crops are designed to better be able to withstand certain stresses, which can preserve yields when the crop is under whichever stress it can withstand. In some cases this can mean the difference between enough of a crop and very little crop.
Right now most GM crops are geared towards livestock feed, fiber, or manufacturing, not so much to be directly eaten by humans. On top of that right now most are cost prohibitive in the areas where it would do the most good, or areas that typically have food shortages.
In this case I would have to say currently it has been very few if any. This technology is still young, as like I said earlier not much directly hits the food chain. However the potential is there where it can increase food production, especially in parts of the world that have a hard time producing enough food where down the road it could save a lot of death by starvation.
Right now most GM crops are geared towards livestock feed, fiber, or manufacturing, not so much to be directly eaten by humans. On top of that right now most are cost prohibitive in the areas where it would do the most good, or areas that typically have food shortages.
In this case I would have to say currently it has been very few if any. This technology is still young, as like I said earlier not much directly hits the food chain. However the potential is there where it can increase food production, especially in parts of the world that have a hard time producing enough food where down the road it could save a lot of death by starvation.
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Probably none. I'm not sure I understand the question. GM crops have enhanced yields, but it's a stretch to say they've saved lives.