Extended Data Table 2 Input parameters for all emissions sources and associated uncertainties

EF_f, EF_e (FS, IE, DE)

Emission factors (kg CO_2e/kg)

ecoinvent & IPCC^18,45

10%

Q_f, Q_e (FS, IE, DE)

Quantity of input (kg/kg product)

IHS⁴⁹

5%

m, m_input (FS, IE, DE, DP)

Masses of output product and input gas for DP (kg)

IHS⁴⁹

5%

M_GHG, M_product (DP)

Molecular masses (kg/mol)

Lide et al.⁵⁵

0%

C (DP)

Process reaction equations (kg GHG/kg)

Levi and Cullen³⁶

1%

X_i - energy (Allocation)

Energy intensities (kJ/kg)

Levi and Cullen³⁶

1%

X_i - economic (Allocation)

Cost values($/kg)

IHS⁴⁹

10%