One of the most pervasive problems afflicting people throughout the world is inadequate access to clean water and sanitation.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/science-and-technology-water-purification-coming-decades
[2] http://admin.indiaenvironmentportal.org.in/category/author/mark-shannon
[3] http://admin.indiaenvironmentportal.org.in/category/author/paul-w-bohn
[4] http://admin.indiaenvironmentportal.org.in/category/author/menachem-elimelech
[5] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-treatment-technology
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/desalination
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sewage-treatment-technology
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/waterborne-worms