Agricultural production is the main consumer of water. Future population growth, income growth, and dietary shifts are expected to increase demand for water. The paper presents a brief review of the water footprint of crop production and the sustainability of the blue water footprint. The estimated global consumptive (green plus blue) water footprint ranges from 5938 to 8508 km3/year. The water footprint is projected to increase by as much as 22% due to climate change and land use change by 2090. Approximately 57% of the global blue water footprint is shown to violate the environmental flow requirements. This calls for action to improve the sustainability of water and protect ecosystems that depend on it. Some of the measures include increasing water productivity, setting benchmarks, setting caps on the water footprint per river basin, shifting the diets to food items with low water requirements, and reducing food waste.

中文翻译：

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全球粮食生产的水足迹

农业生产是水的主要消费者。预计未来的人口增长、收入增长和饮食转变将增加对水的需求。本文简要回顾了作物生产的水足迹和蓝水足迹的可持续性。估计的全球消耗（绿色加蓝色）水足迹范围为 5938 至 8508 平方公里/年。到 2090 年，由于气候变化和土地利用的变化，水足迹预计将增加多达 22%。全球蓝水足迹的大约 57% 被证明违反了环境流量要求。这要求采取行动提高水的可持续性并保护依赖它的生态系统。其中一些措施包括提高水生产力、设定基准、设定每个流域的水足迹上限、