Nicaragua - Saving Lake Managua - For decades unfiltered sewage was allowed to flow into Lake Managua, causing serious pollution. Now a new sewage plant is filtering the water and dried sludge is being used instead of artificial fertlilizers. That saves money and is good for the climate. Social Entrepreneur Christian Hiss: Sustainable Farming in Germany - Christian Hiss wants to save farms facing bankruptcy in Germany and create sustainable farming that is also economically viable. He founded a company in the Freiburg region in 2006. The aim is to enable financing for regional, environmentally friendly and sustainable farming. Kenya - The Greed for Ivory - Elephant tusks are in huge demand on the black market. The price for ivory has doubled in the past two and a half years. Poachers are making big money and that encourages them to take risks. The Save the Elephants organisation in Kenya's Samburu National Park protects the animals. Outside the reserve they are often hunted by poachers. Now park rangers are recruiting workers from surrounding villages who know how the poachers operate and are an effective way of putting a stop to their illegal activities.