1. 7-3
Renewable energy

2. See Ya! Fossil fuels could be gone in 200 years
Safety concerns with nuclear energy
Renewable energy – can be replaced in a human life span

3. Geothermal Energy Energy from the Earth's interior Magma
Steam and hot water – heat
Steam to turn turbine

8. Solar Energy Energy from the Sun’s radiation
Every 15 minutes the Earth gets enough energy from the Sun to energy needs for a year
How to capture it?

9. Passive Systems
No moving parts
Windows facing the Sun

10. Active Systems Solar collectors Water circulates through tubes in box
Photovoltaic cell– solar energy directly into electricity
Small amounts

14. Moving Water Hydroelectric – electricity from moving water Dams Tides
11% of energy in US
Dams
Tides
Rivers

18. Biomass Plant material Manure Organic Matter Burned to generate energy
Developing Countries

20. Wind Energy Wind turbines to generate electricity
Wind – air pressure differences from heating
Wind farms