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In terms of GHG emissions (CF), imported maize bioethanol shows the worst
performance of the six cases, whereas bioethanol from sweet sorghum and construction waste wood shows better performances (Fig. 15.5). Bioethanol from rice
straw emits more GHGs than other domestic cases (cases 3, 4, and 6). The difference between sugarcane ethanol imported from Brazil (case 2) and ethanol from
Fig. 15.4 Ecological footprint per unit of biofuel for five cases each of (a) bioethanol and (b)
biodiesel
Fig. 15.5 Carbon footprints of six bioethanol supply cases from 2015 to 2035
15 National Strategy Options for Japan
In terms of GHG emissions (CF), imported maize bioethanol shows the worst
performance of the six cases, whereas bioethanol from sweet sorghum and construction waste wood shows better performances (Fig. 15.5). Bioethanol from rice
straw emits more GHGs than other domestic cases (cases 3, 4, and 6). The difference between sugarcane ethanol imported from Brazil (case 2) and ethanol from
Fig. 15.4 Ecological footprint per unit of biofuel for five cases each of (a) bioethanol and (b)
biodiesel
Fig. 15.5 Carbon footprints of six bioethanol supply cases from 2015 to 2035
15 National Strategy Options for Japan