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.

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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

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