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Table A1-2: Results of the key category level analysis for 99 percent of the total emissions and removals in 1990

Tier 1 category level assessment - including LULUCF
IPCC categories Gas 1990 estimate Gg Level assessment Cumulative total

Forest land remaining forest land

CO2

20624.90

24.4

24.4

Emissions from enteric fermentation in domestic livestock

CH4

21553.97

25.5

49.9

Emissions from stationary combustion - gas

CO2

7679.40

9.1

59.0

Mobile combustion - road vehicles

CO2

7534.65

8.9

67.9

Emissions from agricultural soils - animal production

N2O

6767.81

8.0

75.9

Emissions from stationary combustion - solid

CO2

3227.01

3.8

79.7

Indirect emissions from nitrogen used in agriculture

N2O

2668.96

3.2

82.9

Emissions from stationary combustion - liquid

CO2

2546.55

3.0

85.9

Emissions from solid waste disposal sites

CH4

2179.23

2.6

88.5

Emissions from the iron and steel industry

CO2

1329.40

1.6

90.1

Conversion to forest land

CO2

870.01

1.0

91.1

Mobile combustion - aviation

CO2

772.83

0.9

92.0

Conversion to grassland

CO2

704.22

0.8

92.8

Direct emissions from agricultural soils

N2O

476.05

0.6

93.4

Emissions from manure management

CH4

583.30

0.7

94.1

Cropland remaining cropland

CO2

538.67

0.6

94.7

PFCs from aluminium production

PFC

515.60

0.6

95.3

Emissions from aluminium production

CO2

457.92

0.5

95.9

Emissions from cement production

CO2

366.66

0.4

96.3

Fugitive emissions from geothermal operations

CO2

357.34

0.4

96.7

Emissions from ammonia/urea production

CO2

272.92

0.3

97.1

Fugitive emissions from coal mining and handling

CH4

272.13

0.3

97.4

Fugitive emissions from oil and gas operations

CO2

263.75

0.3

97.7

Fugitive emissions from oil and gas operations

CH4

262.63

0.3

98.0

Mobile combustion - marine

CO2

247.82

0.3

98.3

Emissions from wastewater handling

CH4

156.66

0.2

98.5

Emissions from hydrogen production

CO2

152.29

0.2

98.7

Mobile combustion - road vehicles

CH4

148.20

0.2

98.8

Emissions from wastewater handling

N2O

146.92

0.2

99.0