Approximately 2.6 billion people around the world lack any sanitation whatsoever. More than 200 million tons of human waste goes untreated every year. In the developing world, 90 percent of sewage is discharged directly into lakes, rivers and oceans. And even in developed countries, cities depend on old, rickety sewage systems which rather than that are easily overwhelmed by heavy rain.
All this untreated sewage adds up to a major public health crisis that kills an estimated 1.4 million children each year, according to the World Health Organization. That's one child every 20 seconds, or more than AIDS, malaria and tuberculosis combined. Despite this massive death toll, sanitation hasn't gotten the same attention as other world development goals. The United Nations, which set a goal to halve the number of people without basic sanitation by 2015, now calls that target "out of reach״.