Here is a good visual for demonstrating the nonrenewable quality of fossil fuels and our dependence on them: pass around an opaque bag of candy, allowing pupils to take as much as they want. You will have prepared the bag to not have enough candy for everyone. Learners compare how much each individual received. Then they relate the activity to the use of fossil fuels, considering their daily activities and the amount of energy that they consume. Use this activity as an anticipatory set when introducing energy use to your class.