Those advocating for GMOs are campaigning tough how they're the solution to famine and land scarcity. Their selling point is that GMOs are fast maturing, highly productive and drought torelant.
If we start by defining words then Genetically Modified Organisms means that the product has it's genes altered which is achieved by introduction of foreign genes with the desired traits and not necessary from a related plant or animal. By doing so, The GMO has some traits that can't be understood and the chances of gene mutation are not ruled out. If this happens then mankind will be a threatened species.