Energy: Perspective

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Energy Perspective
Homework, see Professor Nate Lewis, Global
Energy Perspective http//nsl.caltech.edu/energy.h
tml
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Where is the energy coming from?
current power consumption is 13 TW
see http//nsl.caltech.edu/energy.html
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Projections
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Is this path sustainable?
Remember that all of this fossil fuel combustion
is releasing CO2. How high will CO2
concentrations go? That, of course, depends on
what actions we take!!!! WRE figure for
Wrigley, Richels, and Edmonds Wrigley, T.M.L.,
Richels, R., Edmonds, J. (1996) Economic
and environmental choices in the stabilization of
atmospheric CO2 concentrations. Nature, 379,
240-243 Emissions pathways that lead to CO2
stabilization levels What is the energy mix
pathway that leads to stabilization of
atmospheric CO2 at 450 ppm? WRE 450 path Higher
WRE number means that we are using high intensity
fossil fuel mix, and slowly transitioning to
non-CO2 emitting energy pathways.
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CO2 concentration
How much CO2 are we going to put in the
atmosphere?? That is up to YOU!!
Journal of Climate 2003, 16, 206-223
Mauna Loa Data
Temperature
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1990 12 TW 2050 28 TW
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Fossil Fuel Use and CO2 stabilization
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Projected Carbon free power mix for various WRE
figures
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Where is the energy going?
Spiro and Stigliani, Fig. 5.12. p 119 Flow of
energy through the U.S. economy in the year 2000
(Values are units of exajoules (1015 J)).
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Where is the energy going? Electricity
production
2/3 of energy consumed to produce electricity is
lost!!!
Spiro and Stigliani, Fig. 5.13. p 120 Flow of
energy from electricity through the U.S. economy
in the year 2000 (Values are units of exajoules
(1015 J)).
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US Energy Flow -1999Net Primary Resource
Consumption 102 Exajoules
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