At the river's source

(CNN) -- Vimlendu Jha is the founder and head of Swechha -- We For Change Foundation which is based in India's capital, New Delhi.

Swechha started out as an organization to combat the pollution of the city's main waterway, the river Yamuna. Today it deals with the environmental issues that affect several aspects of Delhi.

Vimlendu leads volunteers and local children to key sites around the city to tackle the ecological problems, as well as to raise awareness of the issues. Follow his efforts in his blogs and video diaries. E-mail to a friend