In Bangladesh, we find out why sanitation should be available to all.
Water and sanitation has not had the same kind of champion that global health, and even education, have had".
The result is ever more competition for space, jobs, water and energy: "There's traffic and water pollution, poor sanitation and even the buildings don't have efficient designs," says Singh. "Another problem is waste management".
Carolynne Wheeler, news manager (acting), WaterAid, London, UK, @carwheeler A former journalist, Carolynne supports WaterAid's policy and campaigns team on media work and advocacy around access to water, sanitation and hygiene.
The private arm of the World Bank, which has lent more than $75bn for water and sanitation projects around the world since 1995, has been in secret talks for more than a year with the city's private water company about funding another possible private-public partnership (PPP) scheme.
About 80% of Lagos's piped water supplies are thought to be stolen, only 5% of people receive it in their houses, taps are often dry, sanitation is non-existent across much of the metropolis and the hospitals are full of people suffering diarrheal and other water-borne diseases.
Related: Brazil drought: water rationing alone won't save Sao Paulo At the Waterbank School in Laikipia, pupils demonstrate in class what they learn about economically and environmentally sustainable rainwater harvesting, water filtration, sanitation and agricultural practices, which is bound to have a wider knock-on effect for their futures.
The jail itself "systematically violated inmates' constitutional rights", according to a 2010 stipulation by the US Department of Justice, through the use of "excessive force by staff, the failure to protect inmates from harm by fellow inmates, inadequate medical and mental healthcare, and a lack of adequate fire safety and sanitation".
In the dense city and slums, sanitation often means open defecation, the use of bags or chamber pots emptied into rubbish heaps or canals, or the construction of crude, shallow pit latrines – everywhere and anywhere.
The need to increase toilet coverage worldwide is now understood to be as crucial as water provision in improving public health and reducing poverty, yet there are still few affordable, off-the-shelf technologies appropriate for meeting the sanitation needs of the 2.5 billion people living without access to an affordable clean toilet.
A recent survey conducted by the British Medical Journal found sanitation to be the best medical intervention in the last 150 years.
