Fig. 2: EFs from mass-, cost- and energy-based allocation.
From: Reducing uncertainties in greenhouse gas emissions from chemical production
Each point represents the EF for one process using the allocation method specified by the point’s color. Points representing EFs for the same process but with different allocation methods are linked by a black line to show the variation due to allocation methods. The key at the top of the figure refers to Fig. 1. a, The range of possible EFs for a set of primary chemicals, intermediate chemicals and thermoplastics. b, Processes, corresponding to the products on the y axis, with the greatest difference due to allocation out of all processes considered. The top half shows those with the greatest difference between mass-based and cost-based, and the bottom half shows those with the greatest difference between mass-based and energy-based. HDPE: high density polyethylene, LLDPE: linear low density polyethylene. See Supplementary Section 2.1 for comparisons for other product groups.
