According to the book "Poison Spring: Secret History of Pollution and EPA," GMOs are primarily developed in order to genetically engineer crops that are able to withstand chemical herbicides and pesticides: "Glyphosate is a powerful driver of genetic engineering. Its creator, Monsanto, has bioengineered 'Roundup Ready' soybeans, corn and other crops to resist Roundup's killing power" (p. 205)... "All genetically modified crops harm the natural world and human health, in large part because they (by definition) invite and encourage the spraying of toxic pesticides" (p. 212). Quoted from E.G. Vallianatos (2014) Poison Spring: Secret History of Pollution and EPA https://www.amazon.com/Poison-Spring-Secret-History-Pollutio...

> A 2014 meta-analysis concluded that GM technology adoption had reduced chemical pesticide use by 37%, increased crop yields by 22%, and increased farmer profits by 68%.[3]

https://en.wikipedia.org/wiki/Genetically_modified_crops

> All genetically modified crops harm the natural world and human health, in large part because they (by definition) invite and encourage the spraying of toxic pesticides

That is a flagrant abuse of the phrase "by definition"! Who is Vallianatos and on what basis does he make these claims? I looked him up and found that he has a BA in zoology and a doctorate in history, so I'd be keen to look at original sources rather than treat him as an expert.