View all publications

Table A1.1 (Table 7.A1 of Good Practice) showing the results of the key category level analysis for 99% of the total emissions and removals in 2003. Key categories are those that comprise 95% of the total.

Tier 1 Source Category Level Assessment - including LULUCF
IPCC Source Categories Gas 2003 estimate Gg Level assessment Cumulative total

Forest land remaining forest land

CO2

25583.91

24.5

24.5

Emissions from enteric fermentation in domestic livestock

CH4

23592.21

22.6

47.1

Mobile combustion - road vehicles

CO2

12094.67

11.6

58.7

Emissions from stationary combustion - gas

CO2

8558.10

8.2

66.9

Emissions from agricultural soils - animal production

N2O

7454.62

7.1

74.1

Emissions from stationary combustion - solid

CO2

5435.29

5.2

79.3

Indirect emissions from nitrogen used in agriculture

N2O

3328.82

3.2

82.5

Emissions from stationary combustion - liquid

CO2

2797.95

2.7

85.2

Direct emissions from agricultural soils

N2O

2185.55

2.1

87.3

Conversion to forest land

CO2

1765.49

1.7

88.9

Emissions from the iron and steel industry

CO2

1716.80

1.6

90.6

Emissions from solid waste disposal sites

CH4

1425.48

1.4

92.0

Mobile combustion - aviation

CO2

1158.33

1.1

93.1

Conversion to grassland

CO2

688.02

0.7

93.7

Cropland remaining cropland

CO2

653.46

0.6

94.4

Emissions from manure management

CH4

549.44

0.5

94.9

Emissions from aluminium production

CO2

542.14

0.5

95.4

Emissions from cement production

CO2

527.47

0.5

95.9

Emissions from substitutes for ozone-depleting substances

HFCs

403.96

0.4

96.3

Fugitive emissions from oil and gas operations

CO2

380.93

0.4

96.7

Mobile combustion - marine

CO2

370.94

0.4

97.0

Fugitive emissions from coal mining and handling

CH4

332.25

0.3

97.3

Fugitive emissions from geothermal operations

CO2

269.11

0.3

97.6

Emissions from hydrogen production

CO2

184.35

0.2

97.8

Emissions from wastewater handling

CH4

166.11

0.2

97.9

Mobile combustion - rail

CO2

164.19

0.2

98.1

Emissions from wastewater handling

N2O

162.89

0.2

98.2

Mobile combustion - road vehicles

N2O

129.91

0.1

98.4

Emissions from lime production

CO2

111.36

0.1

98.5

Non-CO2 emissions from stationary combustion

N2O

104.62

0.1

98.6

Conversion to settlement

CO2

97.17

0.1

98.7

PFCs from aluminium production

PFC

80.70

0.1

98.7

Conversion to cropland

CO2

69.59

0.1

98.8

Emissions from manure management

N2O

61.07

0.1

98.9

Fugitive emissions from geothermal operations

CH4

51.13

0.0

98.9

Mobile combustion - road vehicles

CH4

50.44

0.0

99.0