Transcript Energy – Where does it come from and why does it

How can
changing a light
bulb reduce
greenhouse
gases?
What’s the difference?
Two sides to everything.
Take old
bulbs to
Lowe’s
or Home
Depot!
http://www.mnn.com/earth-matters/translating-uncle-sam/stories/cfl-vs-incandescent-battle-of-the-bulb
Matter Cycles, Energy Flows
Global Warming
Acid Rain Smog
Burning Coal = CO2 + SO + H20 + Ash +
(CxHxSxOx)
Light + Noise + Heat
Example of the Laws of Conservation of Matter and Thermodynamics
http://www.npr.org/news/specials/climate/video/ - episode 4
KWL Chart
What you
KNOW
What you WANT What you
to know
LEARNED
Cartoon: https://www.youtube.com/watch?v=OqVyRa1iuMc
Mini-FBL lesson
What you should know about
global warming…
You have ~20 minutes to…
1. Read and summarize your information.
2. Draw a political cartoon or PSA flyer.
– Should include picture and text
Hole in
the
Ozone
Layer
Climate Change?
• Imagine that last summer was much
hotter than usual where you live. Is this a
sign of climate change? Yes or no?
• Imagine that almost every summer for
the past decade has been hotter than
usual. Is this a sign of climate change?
Yes or no?
Climate change vs. Global warming
• Climate change - major changes in climate
(temperature, rainfall, snow, or wind patterns)
lasting for decades or longer.
• Global warming - average increase in
temperatures near the Earth’s surface and in
the lowest layer of the atmosphere.
– One form of climate change
Global warming
• In specific terms, an
increase of 1 or more
Celsius degrees in a period
of 100 – 200 years would
be considered global
warming.
Contributors
to Global
Warming
• Sources of
electricity
Matter Cycles, Energy Flows
Global Warming
Acid Rain Smog
Burning Coal = CO2 + SO + H20 + Ash +
(CxHxSxOx)
Light + Noise + Heat
http://www.npr.org/news/specials/climate/video/ - episode 4
Byproducts of electrical generation
• Burning coal
Air: Mercury, CO2, SO2, NO2, fly ash
Water: thermal pollution, acid rain
Ground: bottom ash
Simple Solutions…
What if I left my computer on every night…
How much energy would it consume?
Assume 14 hours
• In “sleep” mode, the computer draws 4 watts/hour
How much would it cost the district per day? Per
year?
• 1 kWh costs $0.15
What if all computers at the school were left on?
Energy consumed? Cost to district?
• Around 200 computers at UDHS
What processes involve the transfer of
carbon?
Carbon Cycle Graphic
1. Photosynthesis, decomposition, respiration,
combustion, diffusion, (LABEL ALL)
2. Can you answer the following using your
graphic?
– Where is carbon stored?
– What adds carbon to the atmosphere?
– Where do humans interfere/alter the cycle?
BUT HOW ARE FOSSIL FUELS
FORMED?
http://www.npr.org/news/specials/climate/video/ - episode 2
How Fossil Fuels Are Formed
How Fossil Fuels Are Formed
Matter cycles, energy flows
What is our best immediate energy option?
1. Cut out unnecessary energy waste by
improving energy efficiency
2. Transition to a renewable or solar age
– Sun, wind, flowing water, biomass, geothermal,
hydrogen gas
3. Burn more coal & synthetic gas/liquids
4. Natural gas
5. Nuclear power
No matter
what our
decision…
Ask:
• How much will be available in the
next 15 years? the next 30 years?
longterm?
• What is the source’s net energy
yield?
• How much will it cost to develop,
phase in, and use this energy
resource?
• How will extracting, transporting,
and using the energy resource
affect the environment?
• Can this energy source help us
sustain the earth?
• http://www.youtube.com/watch?v=1xPjESsHwg&feature=related
– Very slow explanation of current & voltage. Nice
analogy to water (river, lake)
• http://www.youtube.com/watch?v=k7Sz8oT8
ou0
– Cardboard generator constrxn (7:44)