Correction for Dalin et al., Evolution of the global virtual water trade network

ENVIRONMENTAL SCIENCES, SUSTAINABILITY SCIENCE Correction for “Evolution of the global virtual water trade network,” by Carole Dalin, Megan Konar, Naota Hanasaki, Andrea Rinaldo, and Ignacio Rodriguez-Iturbe, which appeared in issue 16, April 17, 2012, of Proc Natl Acad Sci USA (109:5989–5994; first published April 2, 2012; 10.1073/pnas.1203176109).

The authors note that they omitted a reference to an article by Krzywinski et al. The complete reference appears below.

Additionally, the authors note that the legend for Fig. 3 appeared incorrectly. The figure and its corrected legend appear below.

Fig. 3.

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). This figure was created using the network visualization software from ref. 29.