First, scientists developed crops that are immune to a weed killer called glyphosate. For example, Roundup is made of glyphosate. Now, farmers can apply glyphosate to kill weeds without harming their own plants. There is another benefit to this solution: “Because the field does not need to be tilled to control weeds, less topsoil is lost to erosion” (Johnson & Raven, 2006, p. 238). Scientists also made plants resistant to insects. They placed a certain gene from soil bacteria into the plants, which makes a protein that harms the stomach of the chewing pests. These crops do not need to be sprayed with pesticides, which are harmful to the environment. Plants can now adapt to different climates and soils too. Pharming genetically changes plants to help them resist weed killers and