http://news.bbc.co.uk/2/hi/south_asia/7070494.stm

A World Toilet Summit has opened in the Indian capital, Delhi, with more than 40 countries taking part.

The four-day meeting will examine solutions and technologies that can be used to provide a basic need for nearly half the world’s population.

According to estimates, 2.6bn people around the world lack access to a hygienic toilet.