According to the United Nations, 2.4 billion people lack adequate sanitation and nearly one billion have no toilet facilities and are forced to relieve themselves in open areas.
The UN Millennium Development Goals, which are supposed to be achieved this year, call for cutting in half the proportion of the population without access to basic sanitation.
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That's why the UN launched a "Call to Action on Sanitation" in 2013 and aims to end "open defecation" by 2025, he said.
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