Table 1.5.3 Key category analysis for the 2004 inventory - Tier 1 trend assessment including LULUCF (a) and excluding LULUCF (b)

(a) Tier 1 category trend assessment - including LULUCF
IPCC categories	Gas	Base year estimate Gg	2004 estimate Gg	Trend assessment	Contribution to trend	Cumulative total
Mobile combustion - road vehicles	CO₂	7534.65	12416.93	0.036	18.5	18.5
Emissions from enteric fermentation in domestic livestock	CH₄	21553.97	23714.98	0.027	13.7	32.1
Emissions from stationary combustion - gas	CO₂	7679.40	7031.32	0.025	12.9	45.0
Emissions from stationary combustion - solid	CO₂	3227.01	5808.96	0.021	10.7	55.7
Direct emissions from agricultural soils	N₂O	476.05	1806.29	0.014	6.9	62.6
Emissions from solid waste disposal sites	CH₄	2179.23	1509.12	0.013	6.4	69.0
Forest land remaining forest land	CO₂	20624.90	26254.43	0.014	7.0	76.0
Emissions from agricultural soils - animal production	N₂O	6767.81	7248.77	0.011	5.4	81.4
Emissions from substitutes for ozone depleting substances	HFCs	0.00	597.36	0.007	3.4	84.8
PFCs from aluminium production	PFC	515.60	80.70	0.006	3.1	87.8
Emissions from stationary combustion - liquid	CO₂	2546.55	2755.47	0.004	1.9	89.7
Conversion to forest land	CO₂	870.01	747.94	0.003	1.7	91.4
Fugitive emissions from oil and gas operations	CO₂	263.75	602.86	0.003	1.6	93.0
Mobile combustion - aviation	CO₂	772.83	1192.23	0.003	1.4	94.5
Fugitive emissions from geothermal operations	CO₂	357.34	279.67	0.002	0.9	95.3

(b) Tier 1 category trend assessment - excluding LULUCF
IPCC categories	Gas	Base year estimate Gg	2004 estimate Gg	Trend assessment	Contribution to trend	Cumulative total
Mobile combustion - road vehicles	CO₂	7534.65	12416.93	0.0362	20.3	20.3
Emissions from enteric fermentation in domestic livestock	CH₄	21553.97	23714.98	0.0268	15.0	35.3
Emissions from stationary combustion - gas	CO₂	7679.40	7031.32	0.0252	14.1	49.4
Emissions from stationary combustion - solid	CO₂	3227.01	5808.96	0.0209	11.7	61.1
Direct emissions from agricultural soils	N₂O	476.05	1806.29	0.0136	7.6	68.7
Emissions from solid waste disposal sites	CH₄	2179.23	1509.12	0.0125	7.0	75.7
Emissions from agricultural soils - animal production	N₂O	6767.81	7248.77	0.0106	5.9	81.7
Emissions from substitutes for ozone depleting substances	HFCs	0.00	597.36	0.0066	3.7	85.4
PFCs from aluminium production	PFC	515.60	80.70	0.0060	3.4	88.7
Emissions from stationary combustion - liquid	CO₂	2546.55	2755.47	0.0037	2.1	90.8
Fugitive emissions from oil and gas operations	CO₂	263.75	602.86	0.0031	1.8	92.6
Mobile combustion - aviation	CO₂	772.83	1192.23	0.0028	1.6	94.1
Fugitive emissions from geothermal operations	CO₂	357.34	279.67	0.0017	1.0	95.1