Policy ForumWater

Water security: Gray or green?

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Science  07 Aug 2015:
Vol. 349, Issue 6248, pp. 584
DOI: 10.1126/science.349.6248.584-a

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Building engineered structures, such as dams and dikes, has been the conventional approach to water management. Some suggest that such “gray” infrastructure make way for “green” ecosystem-based approaches. In this second of three debates, Science invited arguments for how these approaches can address the challenge of building the water security of rapidly growing societies worldwide.