1. The “old renewables” are _____________ and _______________.

The “new renewables” are _____________, ____________, ___________, _________, __________.

2. The fastest growing new renewable is __________________.

3. How much of the world’s total energy comes from renewables?  

 How much of the world’s electricity comes from renewables?           The biggest renewable source of electricity is _____________________?

4. What are the sources of energy included in the term biomass?

 How are they used? (burned directly for heat or to generate electricity, anaerobically digested to produce methane, converted to biofuels, pyrolysis to produce oil)

5. Why are they considered renewable?

What is the net effect on CO2 emissions?

6. Compare ethanol from corn with biodiesel from soybeans. Which is more energy efficient?

What other issues are involved in using these two crops as fuel?

7. How are dairy farmers in the Central Valley using biomass to reduce their disposal and energy costs?

8. What are the pros and cons of hydroelectric power?

 Is there much room for expansion of large-scale hydroelectric in the U.S.? 

9. Passive solar is used for what purposes?

10. How does Active solar differ?

11. Solar collectors can be used to generate _______________.   Are they cost effective?

12. What are solar cells? What does PV stand for? What do they produce?

13. What are the pros and cons of PV electricity?

14. What are the pros and cons of wind turbines?

 If fully developed, how much of the U.S. demand for electricity could be provided by wind power? 

15. Why are offshore sites attractive?

16. Geothermal energy comes from what source?

17. What are the pros and cons of geothermal energy?

18. What are the pros and cons of using ocean energy sources?

19. What are the obstacles to developing and using hydrogen gas as an energy source?

20. In order to be “clean”, that is, non-polluting, how must the hydrogen be generated?

21. How do hydrogen fuel cells work?

What are the inputs?

What are the products?

 22. Which of the renewable sources of electricity are cost effective, that is, produce electricity at the same or lower cost per kwh (kilowatt hours) as cola or other fossil fuels?