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

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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

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