Source: GENETIC LITERACY PROJECT

Critics of crop biotechnology often point to the growth of “superweeds” in corn and soybean fields over the past 20 years as illustrative of the ecological problems posed by crops genetically modified to be resistant to herbicides like glyphosate (trade name Roundup). But superweeds—so named because of their ability to withstand specific herbicides—predate the introduction of GMOs in the 1990s and glyphosate in the 1970s.

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