Table 1.5.2 (a& b) Key category analysis for the 2004 inventory - Tier 1 level assessment including LULUCF (a) and excluding LULUCF (b)

(a) Tier 1 category level assessment - including LULUCF
IPCC categories	Gas	2004 estimate Gg	Level assessment	Cumulative total
Forest land remaining forest land	CO₂	26254.43	25.4	25.4
Emissions from enteric fermentation in domestic livestock	CH₄	23714.98	23.0	48.4
Mobile combustion - road vehicles	CO₂	12416.93	12.0	60.4
Emissions from agricultural soils - animal production	N₂O	7248.77	7.0	67.4
Emissions from stationary combustion - gas	CO₂	7031.32	6.8	74.2
Emissions from stationary combustion - solid	CO₂	5808.96	5.6	79.9
Indirect emissions from nitrogen used in agriculture	N₂O	3271.38	3.2	83.0
Emissions from stationary combustion - liquid	CO₂	2755.47	2.7	85.7
Direct emissions from agricultural soils	N₂O	1806.29	1.7	87.5
Emissions from the iron and steel industry	CO₂	1731.51	1.7	89.1
Emissions from solid waste disposal sites	CH₄	1509.12	1.5	90.6
Mobile combustion - aviation	CO₂	1192.23	1.2	91.7
Conversion to forest land	CO₂	747.94	0.7	92.5
Emissions from manure management	CH₄	745.88	0.7	93.2
Conversion to grassland	CO₂	666.44	0.6	93.8
Cropland remaining cropland	CO₂	662.29	0.6	94.5
Fugitive emissions from oil and gas operations	CO₂	602.86	0.6	95.1

(b) Tier 1 category level assessment - excluding LULUCF
IPCC categories	Gas	2004 estimate Gg	Level assessment	Cumulative total
Emissions from enteric fermentation in domestic livestock	CH₄	23714.98	31.8	31.8
Mobile combustion - road vehicles	CO₂	12416.93	16.6	48.4
Emissions from agricultural soils - animal production	N₂O	7248.77	9.7	58.1
Emissions from stationary combustion - gas	CO₂	7031.32	9.4	67.6
Emissions from stationary combustion - solid	CO₂	5808.96	7.8	75.4
Indirect emissions from nitrogen used in agriculture	N₂O	3271.38	4.4	79.7
Emissions from stationary combustion - liquid	CO₂	2755.47	3.7	83.4
Direct emissions from agricultural soils	N₂O	1806.29	2.4	85.9
Emissions from the iron and steel industry	CO₂	1731.51	2.3	88.2
Emissions from solid-waste disposal sites	CH₄	1509.12	2.0	90.2
Mobile combustion - aviation	CO₂	1192.23	1.6	91.8
Emissions from manure management	CH₄	745.88	1.0	92.8
Fugitive emissions from oil and gas operations	CO₂	602.86	0.8	93.6
Emissions from substitutes for ozone depleting substances	HFCs	597.36	0.8	94.4
Emissions from aluminium production	CO₂	552.29	0.7	95.1