GM crops can protect the environment because they are kinder to nature . Many farmers today depend on chemicals such as pesticides,herbicides,and fertilizers to make their crops grow . Through gene biology,the genes of plants can be modified so that they will be disease-resistant and pest-resistant and still produce the same amount . The most common GM crops grown at the moment are those that resist herbicides . The second most common are those crops that kill pests . Some crops have been grown with herbicides withhout harming the crops . All the weed and other plants die,but the crops does not . By decreasing the number of weeds, the farmer increases the amount of crops grown . A good example of such a crops is GM cotton, which is often grown in the United States for cottonseed oil . If a crops can kill pests,the farmer does not have to spray so often to kill pests . An example of a pest-resistant crops is maize,which is similar to corn . There is a bacterium in the soil which produces a poison that kills insects, but it is harmless to people . Putting this bacterium gene into maize plants makes them produce their own poison,which kills the pests that eat them . This is better for the environment because it reduces the need to spray field with pesticides and fertilizers.