1. Energy Conservation and Resources
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2. Natural Resources can be either Renewable or Non-Renewable
Nonrenewable: energy resources that cannot be replaced by natural processes in less than 100 years.
Renewable: energy resources that can be recycled or replaced by natural processes in less than 100 years.

3. Sustainable energy Fossil fuels Most plentiful fossil fuel in the U.S.
Examples include wood, garbage, & landfill gases

4. Nonrenewable: Fossil Fuels
Fossil fuels such as coal, oil, and gas are being used faster than Earth is able to replace them.
Fossil fuels provide much-needed energy, but certain problems are associated with their use.

5. Burning Fossil Fuels Contributes to the GREENHOUSE EFFECT
Solar radiation from the Sun enters the Earth’s atmosphere.
Most of the sunlight is reflected back into space.
Some of the radiation is trapped as heat near the Earth’s surface.

6. Greenhouse Effect
The greenhouse effect is the rise in temperature that the Earth experiences because certain gases in the atmosphere (water vapor, carbon dioxide, nitrous oxide, and methane, for example) trap energy from the Sun.

7. Greenhouse Effect
Without these gases, heat would escape back into space and Earth’s average temperature would be about 60ºF colder.
Because of how they warm our world, these gases are referred to as greenhouse gases.

8. Greenhouse Effect
Greenhouse gases in the atmosphere behave much like the glass panes in a greenhouse.
Sunlight enters the Earth's atmosphere, passing through the blanket of greenhouse gases.
As it reaches the Earth's surface, the land, water, and the biosphere absorb the sunlight’s energy.
Once absorbed, this energy is sent back into the atmosphere.
Some of the energy passes back into space, but much of it remains trapped in the atmosphere by the greenhouse gases, causing our world to heat up.

9. Greenhouse Effect important.
The greenhouse effect is
important.
Without the greenhouse effect, the Earth would not be warm enough for humans to live.
But if the greenhouse effect becomes too strong, it could make the Earth warmer than usual.
Even a little extra warming may
cause melting of icecaps and many
other problems for humans, plants,
and animals.

10. Renewable, Alternative Energy Sources
There are several types…
Wind energy
Hydroelectric energy
Solar energy
Tidal energy
Nuclear energy
Geothermal energy
Biomass energy

11. Wind Power
Moving wind spins turbines.

12. Hydroelectric Power
Rushing water is used to turn turbines.

13. Solar Power:
The Sun’s heat is used to boil water. This creates steam to turn the turbines. 13

14. Tidal Power
Wave motion spins turbines.

15. Nuclear Power
Heat from nuclear fission reactions boils water to power steam turbines.
Nuclear waste disposal is a problem, but nuclear energy plants do not contribute to air pollution or greenhouse effect.

16. Geothermal Power
Heat from Earth’s core boils water to create steam for turbines.

17. Biomass Power
The burning of wood/plant scraps and garbage creates heat to boil water. This creates steam which spins turbines. 17

18. Alternatives to Fossil Fuels
As you’ve seen there are plenty
of ways to create electricity that
don’t involve burning fossil fuels.
Reducing our dependence on fossil fuels will strengthen our economy and our world political relations as we won’t have to rely on foreign countries for oil.
Also burning fewer fossils fuels will lessen the consequence that burning has on the environment because of the greenhouse effect.