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Reply to Maes et al.: A global estimate of the water footprint of Jatropha curcas under limited data availability

In response to our article on the water footprint (WF) of bioenergy (1), Maes et al. (2) argue that we overestimated the WF of jatropha oil, used data from a limited number of plantations, and made methodological errors. We did use little data, because hardly any data on jatropha production are available. Although we took data from various plantations from different countries, Maes et al. state—based on data from one Egyptian plantation—that we overestimated the WF of jatropha. We cannot see how one can justify such a claim. The WF method is well-established and well-used (1). In contrast, it remains unclear how the low estimate for Egypt is computed because documentation is not available (2).