1. BELLWORK Which type of renewable energy would you prefer - solar or wind? Justify your answer.

2. Renewable Energy

3. Objectives In this lesson you will... 1)Identify pros and cons of renewable energy 1)Describe how energy is produced by each of the renewable methods 1)Evaluate the competing energy solutions

4. Hydroelectric Energy electric energy produced by falling or flowing water

5. How It Works Most hydroelectric power is generated by water flowing through a dam Inside the dam, water flows through a turbine, causing it to rotate

7. Advantages of Hydroelectric Renewable Very Environmentally Friendly Reliable (doesn’t fluctuate) Safe

8. Disadvantages of Hydroelectric Expensive Can affect ecosystems Affected by droughts Limited reservoirs

9. Hydroelectric Power https://www.youtube.com/watch?v=tpigNNTQ ix8

10. Future of Hydroelectricity Currently hydroelectric energy accounts for over 20% of renewable energy used worldwide While large dams are becoming rare, smaller, cheaper dams are beginning to be built

11. Geothermal Energy Energy produced by Earth’s hot, liquid core is called geothermal energy. This heat can be harnessed as energy.

12. How It Works Deep holes are drilled into the Earth Hot water is pumped through these holes

13. Advantages of Geothermal Renewable Environmentally Friendly Great for heating homes in cold countries

14. Disadvantages of Geothermal Drilling and building is expensive Not available in many areas Can cause earthquakes in very rare cases

15. Geothermal Heating/Cooling https://www.youtube.com/watch?v=e1r7fXO0 QII

16. Future of Geothermal Currently used very rarely As technology improves, geothermal may play a bigger energy role in the future

17. Biofuels Energy derived from plant materials is called biofuels. Fuels can be manufactured by chemically breaking down these plants.

18. Using Biofuels Biofuels can be burned in the same way as fossil fuels Currently they are primarily used as a gasoline additive

19. Advantages of Biofuels Often considered to be renewable Environmentally friendly -80% less CO2 emitted than fossil fuels Can be grown locally -prevents us from depending on foreign oil

20. Disadvantages of Biofuels Less efficient than fossil fuels Still causes some pollution Fear of a food or water shortage

21. Biofuels http://nation.time.com/2013/12/13/time- explains-biofuels/

22. Future of Biofuels Currently only about 2% of fuel worldwide If biofuels can become more efficient and don’t affect food supply, they could begin to replace fossil fuels