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Table A1.2: (table 7.A1 from Good Practice Guidance) showing results of the key category level analysis for 99 per cent of the total emissions and removals in 1990

Key categories are those that comprise 95 per cent of the total.

Tier 1 Category Level Assessment - including LULUC

IPCC Categories

Gas

1990 estimate  Gg

Level assessment

Cumulative total

Emissions from enteric fermentation in domestic livestock

CH4

21,806.54

25.6

25.6

Forest land remaining forest land

CO2

20,624.90

24.2

49.8

Emissions from Stationary combustion - gas

CO2

7,691.14

9.0

58.8

Mobile combustion - road vehicles

CO2

7,535.48

8.8

67.6

Emissions from agricultural soils - animal production

N2O

6,856.67

8.0

75.7

Emissions from stationary combustion - solid

CO2

3,227.01

3.8

79.5

Indirect emissions from nitrogen used in Agriculture

N2O

2,701.86

3.2

82.6

Emissions from Stationary combustion - liquid

CO2

2,546.55

3.0

85.6

Emissions from solid waste disposal sites

CH4

2,122.92

2.5

88.1

Emissions from the iron and steel industry

CO2

1,329.40

1.6

89.7

Conversion to forest land

CO2

870.01

1.0

90.7

Mobile combustion - Aviation

CO2

772.83

0.9

91.6

Conversion to grassland

CO2

706.91

0.8

92.4

Emissions from Manure Management

CH4

590.47

0.7

93.1

Cropland remaining cropland

CO2

538.67

0.6

93.8

PFC's from Aluminium production

PFC

515.60

0.6

94.4

Direct emissions from Agricultural soils

N2O

475.16

0.6

94.9

Emissions from Aluminium production

CO2

457.92

0.5

95.5

Emissions from cement production

CO2

441.67

0.5

96.0

Fugitive emissions from Geothermal operations

CO2

357.34

0.4

96.4

other (including liming)

CO2

346.42

0.4

96.8

Emissions from ammonia/urea production

CO2

274.53

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

263.48

0.3

97.7

Fugitive emissions from Oil and Gas operations

CH4

258.74

0.3

98.0

Mobile combustion - Marine

CO2

247.82

0.3

98.3

Emissions from wastewater handling

CH4

222.93

0.3

98.6

Emissions from Hydrogen production

CO2

152.29

0.2

98.8

Emissions from wastewater handling

N2O

146.92

0.2

99.0