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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)