1. Describe the circumstances that would have had to exist for wind power or hydropower to become the main source of electricity instead of coal.
2. How do energy-generating tires work? Where do you think this type of energy would be most useful?
3. Choose one renewable source and list the pros and cons of using it to power the electricity grid. In your opinion, do the pros outweigh the cons for this particular renewable source, or vice versa?
4. Imagine that something wipes out the modern power grid. How would you design the power grid today? Explain why you would or would not change the design.