1. What are two ways in which we waste energy? What are the benefits of reducing this waste? 2. What is the key concept for this section? What are the major advantages and disadvantages of using...

1. What are two ways in which we waste energy? What are the benefits of reducing this waste?

2. What is the key concept for this section? What are the major advantages and disadvantages of using hydrogen as a fuel to use in producing electricity and powering vehicles?