Fig. 10: The uncertainty of crop blue water demand.
Crop blue water demand was estimated based on ten uncertainties for China (a), India (b), and the United States (c). The uncertainties include (1) four crop water requirements (CWRs) datasets25,51,52,53; (2) the use of temporally fixed or time-varying monthly CWRs; and (3) two methods of spatial aggregation for CWRs (gridded CWRs were averaged to the county-/district-level either by simple spatial averaging or by using gridded crop-specific harvested areas as weights). The black solid line represents the mean value, and the shaded area is the 95% confidence interval estimated using the bootstrap method (n = 1000).
