Table 12.1 Emissions of Greenhouse Gases, 1980-2006

Year

Greenhouse Gases

Greenhouse Gases, Based on Global Warming Potential ¹

Carbon
Dioxide ²^,3

Methane

Nitrous
Oxide

HFCs
PFCs
SF6

Carbon
Dioxide ²

Methane

Nitrous
Oxide

HFCs
PFCs
SF6

Total

Million Metric Tons of Gas

Million Metric Tons Carbon Dioxide Equivalent ²

1980

4,824.7

28.6

1.0

– –

4,824.7

658.0

287.0

70.4

5,840.0

1981

4,704.3

29.2

1.0

– –

4,704.3

671.1

292.0

74.0

5,741.3

1982

4,448.8

29.4

1.0

– –

4,448.8

676.8

282.6

55.4

5,463.7

1983

4,408.0

29.1

– –

4,408.0

669.9

270.2

67.1

5,415.3

1984

4,655.8

29.8

1.0

– –

4,655.8

684.5

294.0

75.5

5,709.9

1985

4,638.3

30.0

1.1

– –

4,638.3

689.7

330.7

70.5

5,729.3

1986

4,642.5

29.4

1.1

– –

4,642.5

676.5

323.8

75.0

5,717.8

1987

4,800.2

29.9

1.1

– –

4,800.2

688.3

323.4

77.8

5,889.8

1988

5,012.6

30.1

1.1

– –

5,012.6

692.0

316.9

91.3

6,112.8

1989

5,105.8

30.2

1.1

– –

5,105.8

693.8

332.8

94.5

6,226.9

1990

5,017.5

[R]

30.8

[R]

1.1

– –

5,017.5

[R]

708.4

[R]

333.7

[R]

87.1

6,146.7

[R]

1991

4,969.4

[R]

30.8

[R]

1.2

– –

4,969.4

[R]

707.7

[R]

342.9

[R]

79.0

6,098.9

[R]

1992

5,078.7

[R]

30.9

[R]

1.2

– –

5,078.7

[R]

709.7

[R]

350.0

[R]

83.7

6,222.1

[R]

1993

5,203.0

[R]

29.8

[R]

1.2

– –

5,203.0

[R]

684.8

[R]

349.5

[R]

82.9

6,320.2

[R]

1994

5,288.3

[R]

29.8

[R]

1.3

– –

5,288.3

[R]

685.6

[R]

374.9

[R]

85.3

[R]

6,434.0

[R]

1995

5,343.4

[R]

29.4

[R]

1.2

– –

5,343.4

[R]

675.9

[R]

357.1

[R]

94.9

6,471.2

[R]

1996

5,531.0

[R]

28.5

[R]

1.2

– –

5,531.0

[R]

656.0

[R]

357.6

[R]

110.6

6,655.2

[R]

1997

5,606.7

[R]

28.5

[R]

1.2

– –

5,606.7

[R]

654.6

[R]

350.5

[R]

118.0

[R]

6,729.8

[R]

1998

5,632.5

[R]

27.4

1.2

– –

5,632.5

[R]

631.3

[R]

347.9

[R]

134.4

[R]

6,746.1

[R]

1999

5,703.1

[R]

26.8

1.2

– –

5,703.1

[R]

615.8

[R]

346.3

[R]

133.9

6,799.1

[R]

2000

5,890.5

[R]

26.4

[R]

1.2

– –

5,890.5

[R]

608.0

[R]

341.9

[R]

138.0

6,978.4

[R]

2001

5,806.3

[R]

25.8

[R]

1.1

– –

5,806.3

[R]

593.9

[R]

336.6

[R]

128.6

[R]

6,865.4

[R]

2002

5,875.9

[R]

26.0

[R]

1.1

– –

5,875.9

[R]

598.6

[R]

332.5

[R]

137.8

6,944.9

[R]

2003

5,940.4

[R]

26.2

1.1

– –

5,940.4

[R]

603.7

[R]

331.7

[R]

136.6

7,012.4

[R]

2004

6,019.9

[R]

26.3

[R]

1.2

– –

6,019.9

[R]

605.9

[R]

358.3

[R]

149.4

[R]

7,133.5

[R]

2005

6,045.0

[R]

26.4

[R]

1.2

– –

6,045.0

[R]

607.3

[R]

368.0

[R]

161.2

[R]

7,181.4

[R]

2006^P

5,934.4

26.3

1.3

– –

5,934.4

605.1

378.6

157.6

7,075.6

¹Emissions of greenhouse gases are weighted based upon their relative global warming potential
(GWP), with carbon dioxide equal to a weight of one. The use of updated estimates of GWP resulted in a
number of revisions to previously published data. It is also important to note that revisions in estimated
emissions result from revisions in energy consumption as well.

Notes:  ·  HFCs = hydrofluorocarbons; PFCs = perfluorocarbons; and SF6 = sulfur hexafluoride.
·  Emissions are from anthropogenic sources.  "Anthropogenic" means produced as the result of human
activities, including emissions from agricultural activity and domestic livestock.  Emissions from natural
sources, such as wetlands and wild animals, are not included.  ·  Because of the continuing goal to improve
estimation methods for greenhouse gases, data are frequently revised on an annual basis in keeping with
the latest findings of the international scientific community.  ·  For information on units for measuring
greenhouse gases, see http://www.eia.doe.gov/oiaf/1605/archive/gg06rpt/pdf/executive_summary.pdf,
page 2, box titled "Units for Measuring Greenhouse Gases.  ·  Totals may not equal sum of components
due to independent rounding.

²Metric tons of carbon dioxide can be converted to metric tons of carbon equivalent by multiplying by
12/44.

Web Page: For related information, see http://www.eia.doe.gov/environment.html.

³Carbon dioxide data in this table differ from those for the United States in Table 11.19 because data in
this table exclude emissions from international bunker fuels consumption; include emissions from
geothermal power generation, cement production and other industrial processes, and municipal solid waste
combustion; and include data for the U.S. Territories.

Sources: 1990, 1995, and 1999-2006: Energy Information Administration (EIA), Emissions of
Greenhouse Gases in the United States 2006 (November 2007), Table 1. All Other Data: EIA, Emissions
of Greenhouse Gases in the United States, annual reports and unpublished revisions.

R=Revised. P=Preliminary. – – = Not applicable because these gases cannot be summed in native units.