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An aggregated life cycle sustainability index 381
Cropping
Seed N fertilizers
Field preparation
Diesel P fertilizers
Sowing
Electricity K 2O fertilizer
Irrigation
Herbicide
Fertilization Human labor
Pest control
Pesticide Weeding Machinery
Harvesting
Diesel Crop transport
Steam
Bioethanol production Coal
Electricity
Diesel Bioethanol transport
Bioethanol
Fig. 14.2 The life cycle boundary of bioethanol systems (Ren et al., 2015b).
9:75 0:25 9:75 0:25
½
¼ 1:0000 1:0000 (14.3)
9:75 0:25 9:75 0:25
As for the data with respect to the cost-type criteria, they can also be nor-
malized. Taking the data with respect to CC as an example:
5:746 5:746 5:746 5:746
¼ 00 (14.4)
½
5:746 0:461 5:746 0:461
