In their call for protection of the global water cycle, Johan Rockström and his colleagues propose putting an economic value on ‘green’ water, which is held in the air, biomass and soils (Nature 615, 794–797; 2023). In my view, it’s even more urgent to fix the underpricing of ‘blue’ water in rivers, lakes, reservoirs and aquifers if we are to reduce the risk of water-scarcity crises.
Competing Interests
The author declares no competing interests.
More News
Full-colour 3D holographic augmented-reality displays with metasurface waveguides – Nature
Observation of Nagaoka polarons in a Fermi–Hubbard quantum simulator – Nature
Lithium tantalate photonic integrated circuits for volume manufacturing – Nature