淡水源 meaning in Chinese

freshwater source

But in some parts of the world , supplies of fresh , clean water are becoming so scarce that the health of millions of people are already threatened , a crisis that could affect two thirds of the global population in 30 years ' time
最初我翻成“但在世界上的其他一些地方，干净的淡水源供应正变得极其稀缺，以至于数百万人的健康已经受到威胁，一场可能在30年后影响到全球三分之二的人的危机。