Despite living in the sunny tropics, many people in the Philippines spend their days in darkness cramped together in make-shift homes with limited privacy and electricity.
However, a locally raised social entrepreneur and Liter of Light founder Illac Diaz has developed a green, cheap and simple method to illuminate homes – plastic bottles filled with water and bleach and installed into rooftops.
More than 350,000 people have already had the bottles fixed to their homes and the technology has spread to ten countries.
Russell Beard travels to the Philippines to meet Diaz and some of the people he is training to become Liter of Light installers so that they can earn a green living in their own communities.
'earthrise' is an award-winning series exploring solutions to the environmental challenges we face today.
The programme takes an upbeat look at ecological, scientific, technological and design projects all around the world, from a group of Dutch architects who design stunning buildings made from waste materials, to an ingenious project that has dramatically cut rhino poaching on a South African game reserve.