The physics of climate and of climate changes associated with increasing concentrations of greenhouse gases in the atmosphere are briefly presented. Construction of a “toy model” of the climate is discussed. Possibilities for reducing carbon dioxide emissions are indicated. Degrees of uncertainty characterizing predictions of climate responses to anthropogenic greenhouse gas emissions are presented.

1.
T. E. Graedel and P. J. Crutzen, Atmospheric Change. An Earth System Perspective (W. H. Freeman and Company, New York, 1993).
2.
S. H. Seinfeld and S. N. Pandis, Atmospheric Chemistry and Physics. From Air Pollution to Climate Change (Wiley, New York, 1998).
3.
R. P. Turco, Earth Under Siege. From Air Pollution to Global Change (Oxford U.P., Oxford, 1997).
4.
(a) Climate Change: The IPCC Scientific Assessment, edited by J. T. Houghton, G. J. Jenkins, and J. J. Ephraums (Cambridge U.P., Cambridge, 1990);
(b) Climate Change 1994: Radiative Forcing of Climate Change and An Evaluation of the IPCC IS92 Emission Scenarios, edited by J. T. Houghton, L. G. Meira Filho, J. Bruce, H. Lee, B. A. Callander, E. Haites, N. Harris, and K. Maskell (Cambridge U.P., Cambridge, 1995);
(c) Climate Change 1995: The Science of Climate Change, edited by J. T. Houghton, L. G. Meira Filho, B. A. Callender, N. Harris, A. Kattenberg, and K. Maskell (Cambridge U.P., Cambridge, 1996).
5.
This article is excerpted from material on climate change in a senior-level course, Energy Engineering, offered at the University of Michigan.
6.
The 40-year history of CO2 concentration measured at Mauna Loa shows an annual oscillation of about 8 ppmv associated with seasonal storage and release of carbon in the biosphere superimposed on the long-term rise.
7.
Annual Energy Review 1997 (Energy Information Administration, U.S. Dept. of Energy, 1998).
8.
References for Fig. 1:
J. M.
Barnola
et al., “
Vostok ice core provides 160000-year record of atmosphericCO2,
Nature
329
,
408
414
(
1987
);
J.
Jouzel
et al., “
Climatic interpretation of the recently extended Vostok ice records
,”
Clim. Dyn.
12
,
513
21
(
1996
),
A. Neftel et al., HistoricalCO2Record from the Siple Station Ice Core (Physics Institute, University of Bern, CH-3012 Bern, Switzerland, 1994);
C. D. Keeling; and T. P. Whorf, AtmosphericCO2 concentrations from Mauna Loa, Hawaii (Scripps Institution of Oceanography, 1996);
K. R.
Briffa
and
P. D.
Jones
, “
Global surface air temperature variations over the twentieth century: Part 2, Implications for large-scale high-frequency paleoclimatic studies
,”
Holocene
3
,
82
93
(
1993
).
9.
J. P. Piexoto and A. H. Oort, Physics of Climate (American Institute of Physics, New York, 1992), p. 119.
10.
J. T. Houghton, The Physics of Atmospheres, 2nd ed. (Cambridge U.P., Cambridge, 1986).
11.
J. T.
Kiehl
and
K. E.
Trenberth
, “
Earth’s annual global mean energy budget
,”
Bull. Am. Meteorol. Soc.
78
,
197
208
(
1997
).
12.
D. L. Albritton and R. T. Watson, editors, Scientific Assessment of Ozone Depletion: 1991 Global Ozone Research and Monitoring Project-WMO Report No. 25 (World Meteorological Organization, 1991).
13.
T. H.
Von der Haar
and
V. E.
Suomi
, “
Measurement of the earth’s radiation budget from satellites during a five year period. Part I. Extended time and space means
,”
J. Atmos. Sci.
28
,
305
314
(
1971
).
14.
R.
Binschadler
, “
Future of the West Antarctic Ice Sheet
,”
Science
282
,
428
428
(
1998
).
15.
J. T. Kiehl, “Atmospheric General Circulation Modeling,” in Climate System Modeling, edited by K. E. Trenberth (Cambridge U.P., Cambridge, 1992).
16.
Office of Technology Assessment, U.S. Congress, Changing by Degrees, 1991, Chap. 7.
17.
R. C.
Johnson
, “
Unicycles and bifurcations
,”
Am. J. Phys.
66
,
589
92
(
1998
).
18.
J. B. Heywood, Internal Combustion Engine Fundamentals (McGraw-Hill, New York, 1987), p. 915, Appendix A and Appendix D.
19.
W. L. Nelson, Petroleum Refinery Engineering, 3rd ed. (McGraw-Hill, New York, 1949).
20.
(a) R. W. Williams (private communication);
(b) R. W. Williams, Fuel decarbonization for fuel cell applications and sequestration of the separated CO2, in Eco-restructuring: Implications for Sustainable Development, edited by R. U. Ayres (UN University Press, Tokyo, 1998), pp. 180–222. “A technological strategy for making fossil fuels environment- and climate-friendly,” World Energy Council Journal, 59–67, July 1998.
21.
E. A.
Parson
and
D. W.
Keith
, “
Fossil fuels without CO2 emissions
,”
Science
282
,
1053
1054
(
1998
).
22.
L. F. Hatch and S. Mater, From Hydrocarbons to Petrochemicals (Gulf Publishing, Houston, 1981).
23.
C. Hendricks, Carbon Dioxide Removal from Coal-Fired Power Plants, Ph.D. thesis, Department of Science, Technology and Society, Utrecht University, Utrecht, The Netherlands, 1994.
24.
S. Holloway (British Geological Survey), ed., The Underground Storage of Carbon Dioxide, Report prepared for the Joule II Programme (DG XII) of the Commission of the European Communities, Contract No. JOU2 CT92-0031, Brussels, February 1996.
25.
D. Rice, B. Law, and J. Clayton, “Coal-Bed Gas-an Undeveloped Resource,” in The Future of Energy Gases, U.S. Geological Survey Professional Paper, No. 1570 (U.S. Government Printing Office, Washington, DC), pp. 389–404.
26.
Unless another reference is given, the points raised here were discussed by
J. D.
Mahlman
, “
Uncertainties in projections of human-caused climate warming
,”
Science
278
,
1416
1417
(
1997
).
27.
W. S.
Broecker
, “
Thermohaline circulation, the achilles heel of our climate system: Will man-made CO2 upset the current balance?
,”
Science
278
,
1582
1588
(
1997
).
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