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Human domination of the global water cycle absent from depictions and perceptions

Abstract

Human water use, climate change and land conversion have created a water crisis for billions of individuals and many ecosystems worldwide. Global water stocks and fluxes are estimated empirically and with computer models, but this information is conveyed to policymakers and researchers through water cycle diagrams. Here we compiled a synthesis of the global water cycle, which we compared with 464 water cycle diagrams from around the world. Although human freshwater appropriation now equals half of global river discharge, only 15% of the water cycle diagrams depicted human interaction with water. Only 2% of the diagrams showed climate change or water pollution—two of the central causes of the global water crisis—which effectively conveys a false sense of water security. A single catchment was depicted in 95% of the diagrams, which precludes the representation of teleconnections such as ocean–land interactions and continental moisture recycling. These inaccuracies correspond with specific dimensions of water mismanagement, which suggest that flaws in water diagrams reflect and reinforce the misunderstanding of global hydrology by policymakers, researchers and the public. Correct depictions of the water cycle will not solve the global water crisis, but reconceiving this symbol is an important step towards equitable water governance, sustainable development and planetary thinking in the Anthropocene.

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Data availability

The meta-analysis of global water pools and fluxes is included in Supplementary Table 1. The extracted data from all the diagrams is available in the Supplementary Database 1. The full set of analysed images cannot be published here because of copyright considerations, but all images are available from the corresponding author upon request.

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Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Acknowledgements

Financial support for this study was provided by the Department of Plant and Wildlife Sciences and College of Life Sciences at Brigham Young University and by the European Union’s Seventh Framework Program for research, technological development and demonstration under grant agreement no. 607150 (FP7-PEOPLE-2013-ITN–INTERFACES—Ecohydrological interfaces as critical hotspots for transformations of ecosystem exchange fluxes and biogeochemical cycling). D. Conner created the template for the water cycle used in Figs. 3 and 4. We thank T. Burt, S. Abbott, J. Howe and C. Ash for input on the manuscript and we thank S. Chowdhury for assistance with diagram analysis.

Author information

The concept for this paper emerged during discussion among B.W.A., K.B., G.P., T.K., D.M.H., S.K. and J.P.Z. in 2015. S.P., S.E.G., T.K., J.M., O.U., M.C., R.J.F., B.W.A. and M.B. downloaded and analysed the diagrams. B.W.A. and C.M. managed data and performed statistical analyses. B.W.A. wrote the manuscript with input from all the co-authors.

Competing interests

The authors declare no competing interests.

Correspondence to Benjamin W. Abbott.

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  2. Water Diagram Database

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Fig. 1: Pools and fluxes in the global hydrological cycle.
Fig. 2: Pools and fluxes represented in water cycle diagrams.
Fig. 3: Diagram of the global hydrological cycle in the Anthropocene.
Fig. 4: Some consequences of human interference with the water cycle.