Bangladesh, Dhaka, Three girls at school in slum area.

India, Maharashtra, Mumbai, Muskan, meaning 'smile' in Hindi, kindergarten in Dharavi slum, run by NGO Reality Cares.

India, Maharashtra, Mumbai, Clay pots drying in the sun in the potters' quarter of Dharavi slum.

India, Maharashtra, Mumbai, Clay pots drying in the sun in the potters' quarter of Dharavi slum.

India, Maharashtra, Mumbai, Lane in slum area of Colaba.

India, Maharashtra, Mumbai, Women standing outside their homes in a lane in a slum in Colaba.

Nepal, Kathmandu, view over city housing.

Haiti, La Gonave Island, Young happy smiling girl leant against the wall of a slum building.

Haiti, La Gonave Island, Young girl walking along dirt track.

Philippines, Luzon Island, Manila, Smokey Mountain slum area with children living off rubbish tip.

BRAZIL Rio de Janeiro Favela or slum above Saude neighbourhood, brick houses trees Church and mountain in the background.

BRAZIL Rio de Janeiro Favela or slum on hillside above Copacabana neighbourhood, red brick houses greenery and TV dish antenna.