The studies that prove GMO's are safe are all paid for by Monsanto. Other studies performed by independent labs have raised serious red flags, and they are banned in some countries.
Cross breeding, etc is completely different from splicing the genes and introducing very odd substances into the genetic make up of the seed
Using GMO seeds has not increased food worldwide, what it has done is increase the amount of round up(manufactured by Monsanto) that has to be bought to use with the seeds, and Monsanto now has a monopoly on the seed market. Since genetically modified crops produce seeds that can not reproduce, you have to buy more each year. For a farmer, that is thousands of dollars.The farmer in my family that grows the most corn says that he is buying twice as much round up now as he did before GMO seeds. He also gets less corn per acre, but for some reason which I can't figure out, he thinks GMO seeds are great, wants to see world hunger solved. (with less crop???)
I come from a line of farmers. They saw their crop yield increase the first year or so they use a seed, then see it decline. Some crops, especially corn, has been producing less than before GMO's, according to them.
Are they safe? Is it a good thing? Is Monsanto doing this to feed the world, or line their pockets? IMO it is not safe, it is not a good thing, and it is profit motivated. And I will not eat GMO foods, Since they aren't required by law here to label them, I have to look for the GMO free labels on foods that are being grown genetically modified. Limits choices, cost more, but to me it's worth it.
Everyone will have to decide for themselves if they are comfortable eating these things. The bad part is with corn, we have no choice. Non GMO corn raised within.,. I think it is 8 miles, single digit for sure, gets cross polinated and becomes GMO. Forcing everyone to eat GMO corn or pay outrageous prices for corn that has been greatly protected.
I try to grow most of my own fruits and vegetables, but won't even bother planting corn. The place I buy seeds from no longer even sells corn seeds, because they feel they can't guarantee that they have not been contaminated. I have some heirloom seeds from about 5 years ago, vac sealed and stored in the fridge. I hope some day that it will be safe to plant them again, and that at least enough of the seeds will grow to be able to harvest the seeds.