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Results: 4

1.
Fig. 1.

Fig. 1. From: Evolution of the global virtual water trade network.

Evolution of global variables relative to 1986 values (percent difference). GDP and population information was from ref. 20. Virtual water flow and number of links information was from this study. Total crop yield of five crops information was from ref. 13.

Carole Dalin, et al. Proc Natl Acad Sci U S A. 2012 April 17;109(16):5989-5994.
2.
Fig. 4.

Fig. 4. From: Evolution of the global virtual water trade network.

Evolution of important features of VWT. (A) China's VWI associated with soy over time broken down into the corresponding exporting countries. (B) Global water savings over time. The shaded area shows the total global water savings from crops and livestock (beef, poultry, and pork) trade. Individual lines show the global water savings associated with trade of that particular crop. Note that the dramatic increase in global water savings from soy trade corresponds to the increase in China's imports from more efficient countries of production (the United States, Argentina, and Brazil).

Carole Dalin, et al. Proc Natl Acad Sci U S A. 2012 April 17;109(16):5989-5994.
3.
Fig. 2.

Fig. 2. From: Evolution of the global virtual water trade network.

Networks statistics and best functional fit in 1986 (A, C, and E) and 2007 (B, D, and F). (A and B) Volume of virtual water traded (i.e., node strength) vs. number of trade partners (i.e., node degree) and power law fit s(k) ∝ kα (fitting with least squares method). (C and D) Node degree exceedance probability distribution with its mean value and corresponding exponential fit. (E and F) Node strength exceedance probability distribution with its mean value and corresponding stretched exponential fit.

Carole Dalin, et al. Proc Natl Acad Sci U S A. 2012 April 17;109(16):5989-5994.
4.
Fig. 3.

Fig. 3. From: Evolution of the global virtual water trade network.

Virtual water flows between the six world regions: Africa (Af), North America (NA), South America (SA), Asia (As), Europe (Eu), and Oceania (Oc). (A) Regional VWT network in 1986. (B) Regional VWT network in 2007. Numbers indicate the volume of VWT in cubic kilometers, and the links’ colors correspond to the exporting regions. The regional map at the bottom left provides a key to the color scheme and acronyms of the regional VWT networks. The circles are scaled according to the total volume of VWT. Note the large difference between total VWT in 1986 (A; 259 km3) and 2007 (B; 567 km3).

Carole Dalin, et al. Proc Natl Acad Sci U S A. 2012 April 17;109(16):5989-5994.

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