1. Renewable energy
Alternatives to fossil fuels

2. Which countries consume the most energy?
Pair share: How much more energy do Americans use than Chinese?

3. Alternative energy sources
Solar
Wind
Geothermal
Nuclear
Tidal
Hydroelectric
Biofuel
We are searching for other sources of energy
Renewable resources will not run out
Environmental impacts could be much less

4. Solar power Turning light energy into electricity
Sun produces 10,000 x the amount of energy needed to power the world
Adv: Free, non-pollution
Dis: Expensive to build and install the panels
& don’t work at night/ cloudy

5. Nuclear Energy Nuclear fission: splitting large atoms releases energy
Adv: plenty of fuel, no greenhouse gasses, existing technology
Dis: radioactive waste which causes cancer

6. Tidal power
Pair share: how could tidal power harm sea life?
Building a dam in a bay or estuary to use the tides to turn turbines
Adv: non polluting, renewable
Dis: only available in limited areas, could harm sea life

7. Hydro-electric
Moving water turns turbines to Most rivers are already dammed
Causes problems for fish, downstream habitats

8. Reducing energy waste All forms of energy generation waste energy
Power plants are only 35% efficient
We need to reduce our energy use and energy waste
157 mpg car
White board: list 3 ways you can save energy.

9. Review How much energy does the US use compared to the world average?
Name an advantage to solar energy.
Name a disadvantage to tidal power.