Financial Times: A new solar-powered cooker fashioned from cardboard boxes has won a prize that will fund its manufacture for use across the developing world. The “Kyoto Box” consists of two cardboard boxes — one inside the other — with an acrylic lid that traps heat from the sun, acting as a hob. Black paint, foil and insulation work together to raise the temperature to the boiling point of water. The cooker was chosen as the winner of the Financial Times Climate Change Challenge by a panel of …