text:  All the glaciers in the world contribute about a quarter of global sea level rise. And Alaska is the biggest contributing place. These glaciers are really important in driving sea level rise, certainly over the next 100 years. That was scientist Beth Ann Davis speaking about North America's melting glaciers. And that's it from this edition of the Newsroom programme. Thanks very much for listening. Stay tuned to BBC World Service for a summary of world news.