Tons of World War II munitions, a huge dead zone and global warming are putting the squeeze on the already highly vulnerable Baltic Sea. Can this crucial European body of water still be saved?
From this tiny island, they've watched the sea for 60 years. Here's what they've learned. nationalgeographic.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from nationalgeographic.com Daily Mail and Mail on Sunday newspapers.