1. Monthly blue water scarcity maps
Please cite the data as:
Mekonnen, M.M. and Hoekstra, A.Y. (2016) Four billion people facing severe water scarcity, Science Advances, 2(2): e 1

2. The water footprint of humanity: not sustainable
Blue water scarcity = blue water footprint / blue water availability
Citation: Mekonnen, M.M. and Hoekstra, A.Y. (2016) Four billion people facing severe water scarcity, Science Advances, 2(2): e
Strong points:
We improve upon past efforts:
by using estimates of blue water footprints (consumptive use of ground- and surface water flows) rather than water withdrawals,
accounting for the flows needed to sustain critical ecological functions, and
by considering monthly rather than annual values
Source: Mekonnen & Hoekstra (2016)
On monthly basis
Accounting for environmental flow requirement
At 30 arc-minute
Blue water scarcity = blue water footprint / blue water availability

3. Number of months in which blue water scarcity is above 100%
Source: Mekonnen & Hoekstra (2016) 3

4. Monthly blue water scarcity
Source: Mekonnen & Hoekstra (2016) 4

5. Monthly blue water scarcity
Source: Mekonnen & Hoekstra (2016) 5

6. Monthly blue water scarcity
Source: Mekonnen & Hoekstra (2016) 6

7. Monthly blue water scarcity
Source: Mekonnen & Hoekstra (2016) 7

8. Monthly blue water scarcity
Source: Mekonnen & Hoekstra (2016) 8

9. Monthly blue water scarcity
Source: Mekonnen & Hoekstra (2016) 9

10. Monthly blue water scarcity
Source: Mekonnen & Hoekstra (2016) 10

11. Monthly blue water scarcity
Source: Mekonnen & Hoekstra (2016) 11

12. Monthly blue water scarcity
Source: Mekonnen & Hoekstra (2016) 12

13. Monthly blue water scarcity
Source: Mekonnen & Hoekstra (2016) 13

14. Monthly blue water scarcity
Source: Mekonnen & Hoekstra (2016) 14

15. Monthly blue water scarcity
Source: Mekonnen & Hoekstra (2016) 15