An increase in population leads to more cars on the road. That could clog the roads. Adding extra lanes of traffic and roads could help address this problem. But roads cost a lot of money and might require clearing away valuable natural resources. More people also means the demand for food will increase. People will have to grow more crops, or cities will have to provide more ways to get groceries. Growing more crops and setting up grocery stores will cost money and use up land, just as adding roads does. A larger population also puts a strain on utilities, such as electricity. Increased demand may result in the depletion of fossil fuels, which can interfere with the fuel needs of future generations. Investments in clean energy could help limit this effect.