ofc, we could feed the planet easily thanks to the GMO, but some people are sceptical of it. But there are more problems to be solved with the overpopulation than just food.
GMO is not the solution to over-population. The ideal solution to over-population is family planning. We need a smaller and healthier population, than a bigger and unhealthy population. GMO food is banned in a lot of nations.
That was just a solution to overfeeding. Well that's the hardest part of it. How to regulate it in the third world countries, their government doesn't care why should they? Systematic sterilization, forced, after one child could slow it down a little.