It can disrupt the functioning of other genes and create new proteins never found in the food supply, creating toxins and allergens in foods and leading to resistance to antibiotics and a subsequent resurgence of infectious diseases. . Many farmers fear that it will be impossible to prevent genetically modified crops from "polluting" organic farms, because wind and bees naturally carry pollen from genetically modified crops to neighboring organic farms. Additionally, crops genetically engineered to be herbicide-resistant, such as Roundup Ready soybeans, have already been shown to result in greater herbicide use, further polluting groundwater, lakes and rivers. Heavy use of herbicides may also encourage the development of herbicide-resistant “superweeds,” which could threaten crops across the world..