Australia: From Tuna Hunter to Sushi Saver: Bluefin tuna are threatened by extinction as the global appetite for the fish soars. A fishing ban is unlikely, so one solution is to breed the fish in underwater cages. But they're not easy to rear in captivity. In Australia, German-born Hagen Stehr is working to mimic natural living conditions of the fish in his onshore farm. The idea is to create an artificial model of the journey to their spawning grounds in order to trick the fish into reproducing. Philippines - the Children of Foreigners : Each year, cheap flights allow thousands of foreign to visit the Philippines, a sex tourist destination for many. Over 12,000 young women work in bars in Angeles, the country's largest red light district. Condoms are rarely used in the deeply Catholic country and many women get pregnant. Around 1,500 women in Angeles alone have a child with a foreign father. Karl is one of them. His mother Letty Casbadillo was abandoned by her German partner who returned to Frankfurt. Saving Madagascar's Forests with Solar Cookers : The inhabitants of Madagascar traditionally use wood charcoal for cooking. But it's expensive and also leads to deforestation. Once a lush, green island, Madagascar loses around 200,000 hectares of forest each year. Solar cookers are meant to cut the reliance on firewood and save the threatened forests. The latest cooker model developed by Swiss development group ADES boasts a special feature - an integrated battery that can help charge electrical devices.