With large scale mono crops that we have today, the appearance of new agressive pests and weeds increases the price of conventional methods of control such as pesticides and herbicides. Yields don't change much bc we simply spray more, but our costs greatly increase and thus the food price increases. Also note that in areas where roundup resistant soybeans have been properly used one can return to using conventional crops bc the weed seed bank in the soil is diminished enough to allow conventional control methods. So when you see that conventional crops produce the same as gmos, well that is true, but not all fields can take on conventional crops, especially where there are sloppy farmers.
It is just one more tool for the farmers.
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