. 2009 Aug 14;2:15. doi: 10.1186/1754-6834-2-15

Table 7.

Emission factor parameters included in the sensitivity analysis.

Parameter	Unit	Base-case value.unit^-1	% Variation relative to base-case		Remark

			Min	Max
Softwood production transport and size reduction		46.0	0.5	1.9	Range reflects the difference between high and low estimates for softwood emissions, excluding land-use change
	kgCO₂e.odt^-1
Straw production and transport		2.6	0.5	2	This range is illustrative only and reflects variation around the lower estimate for straw

Enzyme production	kgCO₂e.kg protein^-1	9.55	0.1	1.4	Range reflects the carbon intensity of enzyme manufacture using Swedish or UK electricity relative to EU 27

Process electricity purchased	kgCO₂e.MWh^-1	340.8	0.1	1.4	Range reflects the carbon intensity of Swedish and UK electricity relative to EU 27

H₂SO₄^a		0.5	0.5	2	A range of -50% to +100% was considered sufficient
					to cover uncertainties in production emissions
NaOH^b		0.58

SO₂^a	kgCO₂		0.641
	e.kg^-1
(NH4)2PO4^c		1.67

MgSO₄^.7 H₂O^d		0.56

^aBoustead database [38]. ^bDEAM database [39]. ^cEstimated from mass proportion of NH₃with H₃PO₄(reported in DEAM database). ^dReported in GREET 1.8, Ag_Inputs!AA43:AA52 – sum of production and process emissions, assumed to be the same as CaCO₃.