Energy and Environment, Class 4

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Energy and Environment, Class 4

• Current events?
• First field trip Oct. 22.
• Future field trip brainstorm.

2
Packet 1 Logistics

• Packet is due October 26.
• Contents
• Dear Jack Letter
• Responses to chapters 1-4
• Edited version of bad writing
• Your rough draft of the values statement
• Your partners critique of your statement
• Your final draft of the values statement
• Need rough draft finished by October 19

3
Ecological Footprint Issues

• New version of footprint spreadsheet
• Need to do the analysis for a household or an
  individual.
• You can choose to account for purchases by
  quantity or dollars spent
• For durable goods, you need to choose to account
  for things up front or over the life of the item.

4
If you want to calculate the footprint for your
household, account for you roomates in IV. If
you live alone or dont share stuff with
roomates, then it is better to account for
yourself, only.
5
To see comments in cells with little red
triangles, move cursor over it. Often, it will
give you an average number. Blue cells are where
you need to input data.
6
This distribution of electricity sources is for
California. Your natural gas bill will probably
be in CCF (hundreds of cubic feet). The note in
the cell tells you how to convert to therms
(100,000 Btu)
7
You should choose transportation estimates so
that your annual amount is realistic. This is
especially critical for airplane use.
8
Here you can choose to account for items up front
or to divide the accounting out over the life of
the item. If you choose the latter, you need to
account for everything you own that way.
9
Dont forget about tuition!!
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These constants are used in the footprint
calculations. They assume that your footprint
for fossil fuel use is the amount of land that
would be required to grow plants to absorb the
carbon dioxide you are emitting.
12
These are fudge factors that they used to make
their household calculation agree better with a
national calculation they did for the U.S. I took
the fudge factors out of our calculation in the
new version.
13
This is the key chart that shows how your
ecological footprint is distributed. In your
essay, you will want to discuss how your fossil
energy use contributes to your overall footprint.
14
The average U.S. citizen has a footprint of 24
acres according to Redefining Progress. The
average world citizen is about 5.7 acres. There
are about 4.9 arable acres per person on Earth.
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I added this piece, converting the footprint
areas back to energy use.