Predicting the impact of climate change on crop water footprint using CMIP6 in the Shule River Basin, China.

12 found that the total crop WF was 856.34 × 10 9 m 3 with the per capita value of 648.11 m 3 a -1 in 2007; however, over time, the WFs of grain crops showed a decreasing trend in most Chinese provinces, especially in the more developed cities and main grain-producing provinces 13 .

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Results indicated: (1) an increasing trend of the overall crop WF, with blue WF accounting for 80.31–99.33% of the total WF in the last 30 years.

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