GMO is simply genetically modified organism. Plants, specifically corn and soy, we modified by pesticide companies one of two primary ways. First, as Monsanto did, was gene insertion to induce tolerance to a given pesticide. Secondly, like the old American Cyanamid company did, was to plant a field of a crop, spray with a herbicide that crop was not tolerant to and harvest the seeds of the plants that survived the application. Plant a large enough field and there would always be some plants that survived. Keep planting those seeds and cross pollination would increase the naturally occurring tolerance to the pesticide being applied. Both methods had the same outcome at the end of the day.
@deersniper is correct in his explanation of the approach to using Roundup. Once a plant is resistant applying more pesticide does not overcome that resistance. Then a process called Integrated Weed Management should be applied to combat and minimize resistance.
GMO does not mean specifically inducing resistance to RoundUp. Years ago DuPont produced GMO corn that contained more Vitamin A to help malnutrition induced blindness in Africa. GMO is simply a genetic modification to yield a desired outcome.
I think some mix up the Round up ready crops, with the BT line of GMO crops. I.E crops designed to poisonous to their pest.
While the reasons and the order of operation are incorrect in that post. The fact that remains, is round up ready crops allow for glyphosate to be sprayed on food. Before if you had weeds in your hay, peas, soy beans, corn..... spraying everything was simply not an option.
The microbes that we form a symbiosis with in our gut, our micro biome, don't seem to like the stuff. This is where science runs out and feelings start, because we don't know much about our own micro biome. Until not long ago, most bacteria and fungus was thought to " just be there" and serve no real purpose. We are learning this is very wrong, and some things we are doing are having unintended side effects, due to our lack of understanding of how some natural systems work.
The BT crops would seem to me to pose a threat to our own gut flora. Again though, a feeling. I am not professing to know.
I wonder if organic matters as much as staying away from processed garbage food, but I have become an Organo-nazi.