Solar-powered cardboard oven targets developing countries

The winner of a contest to find the world's greenest invention is a solar-powered oven made from cardboard. The Kyoto Box oven - which costs just £3.50 to make - can cook casseroles, boil water and bake bread and is the brainchild of Kenya-based entrepreneur Jon Bøhmer. The oven is targeted at the three billion people who use firewood to cook in developing countries. Mr Bøhmer says: "We're saving lives and saving trees." Read more...