MET 12 Global Warming: Lecture 13
Energy
Shaun Tanner
San Jose State University
Outline:
 Energy use
 Story of Stuff
1
Energy and Climate Change
 Obviously, one of the main issues related to
climate change is the burning of fossil fuels
 Thus, energy use, and the continuing demand
for energy are central to the challenges of
climate change.
2
Greenhouse Gas Emissions
CO2 emissions per person
US CO2 Emissions
 Total emissions ~ 5,788.5 million metric tons
 ~ 22 metric tons per person




Industry: 35%
Transportation: 33%
Residences: 18%
Commercial: 14%
 1,600 million metric tons due to personal use (~33%)
5
Average US Personal Energy Use
(Per Person)
Automobile fuel: 38 gallons per month
Natural Gas: 15 therms per month
Electricity: 190 Kilowatt-hours per month
Airline Miles flown 147 miles per month
Total:
Latest estimate ~ 17,600 lbs of CO2
Kyoto allowance (for US):
~11,000 pounds
To stabilize climate (550ppm)
4,700 pounds
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8
Questions
1. What percentage of electricity generation comes from
the burning of natural gas?
2. What percentage of transportation energy comes from
natural gas burning?
3. What percentage of transportation energy use comes
from coal?
4. If you buy an electric car, what is the mostly likely
source of energy?
5. Where does most residential energy come from?
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What percentage of electricity
generation comes from the burning of
natural gas?
1.
2.
3.
4.
5%
10%
17%
61%
10
If you buy an electric car, what is the
most likely energy source
1. Natural gas
2. Coal
3. Petroleum
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Solutions require reductions
in energy use…
Energy is used to make many
things…
Apple
Apple
Ipod
1 Energy Unit
Photo credit: Terry
Nathan
How many energy units to make an iPod?
1.
2.
3.
4.
5.
6.
Between 0-5
Between 5-20
Between 20-50
Between 50-500
Between 500-5000
Between 5000-10000
Apple
1 Energy Unit
Apple
Ipod
100-250 Energy Units
Photo credit: Terry
Nathan
Carbon Footprint
of Apple products
MacBook Air -20011
13-inch MacBook Pro
17-inch MacBook Pro
15-inch MackBook Pro
MacBook-2008
iMac (24 inch)-2011
iMac (20 inch)-2011
LED Cinema Display
Mac Pro
Mac Min
iPhone 3GS
iPhone 4S
iPod nano
iPod touch
iPod shuffle
Direct and Indirect Energy
Mitigation of climate change
 Mitigation:
– Steps taken to avoid or minimize negative
environmental impacts.
 Mitigation can include:
– avoiding the impact by not taking a certain
action;
– minimizing impacts by limiting the degree or
magnitude of the action;
– rectifying the impact by repairing or restoring
the affected environment
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Story of Stuff
1. Extraction
2. Production
3. Distribution
4. Consumption
5. Disposal
 Planned and perceived obsolescence
 Connections with climate change
20
Story of Stuff Assignment (Due Nov 1st)
Write a paragraph describing connections
between the story of stuff and global warming
Also in your paragraph, include the pros and
cons of recycling.
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