全球变化知识资源中心

Global freshwater resources have faced critical water security challenges during the 21st century in the world's river basins. Shortages of water have impaired economic development by disrupting regimes of river flows, ecosystem functioning and food security. Excessive surface and groundwater withdrawals have almost reached the threshold. The current withdrawals of total water (4700 km(3)center dot y(-1)) suggest the imbalance of water use and renewal rates in the world's river basins. The water security issues are further intensified by phosphate and nitrate pollution from land use and climate change. Today, about 400 million people worldwide experience extreme shortages of water for daily use. Limited availability of water which needs to meet the basic needs of hygiene and sanitation for consumption and other uses has increased competition among users. While the society demands more water-intensive goods and services, the ecosystems are however left behind, consequently leading to increased conflicts and insecurity. Equitable water allocation for people and nature is becoming increasingly urgent. However, understanding the complex interactions between the society and nature in the world's river basins is limited. This paper aims to unravel some key strategies that enhance future water security through the advancement of science, knowledge and technologies in the world's river basins.