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Table 1 Summary of water footprints of biofuels in different regions

From: Regional water footprints of potential biofuel production in China

Biofuels Feedstock Region Water footprint (L H2O/L biofuel) Source
Total Blue Green Grey
Bioethanol Cassava Global 2926 420 2506 [43]
China 2827 22 520 2384 [40]
Thailand 2414 703 1641 70 [39]
Thailand 2161 6 2147 8 [41]
Thailand 2021 335 1686 [48]
Thailand 2582 449 2389 [49]
Nigeria 783 407 376 [50]
Sorghum Global 9812 4254 5558 [43]
Taiwan 4394 1740 2291 364 [42]
China 13,541 35 1195 12,310 [40]
Biodiesel Jatropha curcas Mozambiquea 15,264 3 15,261 [46]
South Africaa 8281 [45]
China 4565 23 845 3697 [40]
Globalb 19,924 11,636 8288 [43]
  1. Conversion factors: Heating value—biodiesel: 37.7 MJ/kg [45], bioethanol: 29.7 MJ/kg; density—biodiesel: 0.88 kg/L; bioethanol: 0.7893 kg/L
  2. aOnly Jatropha oil is considered, not biodiesel
  3. bAverage values for five countries (India, Indonesia, Nicaragua, Brazil, and Guatemala)