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Journal Article

A planetary boundary for green water

Authors

Wang-Erlandsson, Lan
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/persons/resource/Arne.Tobian

Tobian, Arne
Potsdam Institute for Climate Impact Research;

van der Ent, Ruud J.
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Fetzer, Ingo
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te Wierik, Sofie
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Porkka, Miina
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Staal, Arie
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Jaramillo, Fernando
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Dahlmann, Heindriken
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Singh, Chandrakant
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Greve, Peter
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/persons/resource/Dieter.Gerten

Gerten, Dieter
Potsdam Institute for Climate Impact Research;

Keys, Patrick W.
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Gleeson, Tom
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Cornell, Sarah E.
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Steffen, Will
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Bai, Xuemei
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/persons/resource/johan.rockstrom

Rockström, Johan
Potsdam Institute for Climate Impact Research;

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Citation

Wang-Erlandsson, L., Tobian, A., van der Ent, R. J., Fetzer, I., te Wierik, S., Porkka, M., Staal, A., Jaramillo, F., Dahlmann, H., Singh, C., Greve, P., Gerten, D., Keys, P. W., Gleeson, T., Cornell, S. E., Steffen, W., Bai, X., Rockström, J. (2022 online): A planetary boundary for green water. - Nature Reviews Earth & Environment.
https://doi.org/10.1038/s43017-022-00287-8

Abstract

Green water — terrestrial precipitation, evaporation and soil moisture — is fundamental to Earth system dynamics and is now extensively perturbed by human pressures at continental to planetary scales. However, green water lacks explicit consideration in the existing planetary boundaries framework that demarcates a global safe operating space for humanity. In this Perspective, we propose a green water planetary boundary and estimate its current status. The green water planetary boundary can be represented by the percentage of ice-free land area on which root-zone soil moisture deviates from Holocene variability for any month of the year. Provisional estimates of departures from Holocene-like conditions, alongside evidence of widespread deterioration in Earth system functioning, indicate that the green water planetary boundary is already transgressed. Moving forward, research needs to address and account for the role of root-zone soil moisture for Earth system resilience in view of ecohydrological, hydroclimatic and sociohydrological interactions.