A solar-powered cooker, made for $6 from two cardboard boxes, won a $75,000 award offered for ideas that can combat global climate change.
Called the Kyoto Box, the device is meant to be used by the billions of people worldwide who rely on wood stoves for cooking and for sterilizing water.
The Kyoto Box consists of a black inner cardboard box and a silver foil-covered outer box that concentrate enough heat to cook food and boil water.
The design took the top prize in the FT Climate Change Challenge promoted by the Financial Times, Hewlett-Packard and Forum from the Future.
"We're saving lives and saving trees," the Kyoto Box's developer Jon Boehmer, a Norwegian based in Kenya, said in a statement.
Boehmer said he would carry out trials in 10 countries, including South Africa, India and Indonesia, before applying for carbon credits to support dissemination of the solar cooker.
Other finalists included an indoor cooling system that uses evaporative ceiling tiles, a large-scale microwave for the production of biochar, a garlic-based feed additive to reduce methane emissions from livestock and an aerodynamic wheel cover for long-haul trucks.
Read more about the Finalists at the link below.