List the Advantages and disadvantages of using wind to produce electricity.
List the advantages and disadvantages of using hydrogen gas to heat air and water, produce electricity, and propel vehicles.
List the advantages and disadvantages of using direct solar energy to heat air and water for buildings and to produce electricity.
List the advantages and disadvantages of using water in the forms of hydropower, tidal power, wave power, and ocean thermal currents to produce electricity.
Describe changes which can be made in industry, transportation, buildings, lights, and appliances which would improve energy efficiency.