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… per cent of the world’s population live without improved sanitation. Reducing half the proportion of people without access to improved sanitation by 2015 is one of the Millennium Development Goal targets. Inadequate sanitation is a highly important issue around the world, as …

… World Health Organization; 2011 (http://www.who.int/water_sanitation_health/ publications/dwq-guidelines-4/en/, … http://www.who.int/water_sanitation_health/publications/dwq-guidelines-4/en/ … http://www.who.int/water_sanitation_health/publications/dwq-guidelines-4/en/ …

… Goals, in particular water protection, improved sanitation, solid waste management and economic and social …