At the dawn of the 21st century, some 1.1 Billion people on Earth are still without access to a safe water supply and over 2.4 Billion are without adequate sanitation.

• 在21世纪初期,地球上仍然有11亿人口无法获得安全的水源供应,并且超过24亿人口缺乏公共卫生设施。