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.

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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

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