> percent of people who have access to clean water This number is actually measured, because it is target 7.C of MDG(Millennium Development Goals). Lots of dat

> percent of people who have access to clean water This number is actually measured, because it is target 7.C of MDG(Millennium Development Goals). Lots of data at http://mdgs.un.org/ http://mdgs.un.org/. Summary is that we are doing very well on this number. In 1990 it was 76%, now it is 91%. In the absolute number, 2.6 billion people gained access to clean water in the period.