100 Ideas to Save the WorldTV Show

Four ideas about creating unexpected value from things that have seemingly outlived their purpose. A recycling company's stoic quest to make useful resources from waste. Waste from oranges squeezed for juice is turned into food for fish farming. People and a local railway company band together to revitalize their depopulated town into an attractive tourist destination. And the story of a German architect who has brought new residents to depopulated areas by renovating vacant old houses into beautiful buildings.