World's glaciers melting faster than ever, expert says

The world's glaciers are losing an average of 273 billion tonnes of ice per year – that's equivalent to around three Olympic-sized swimming pools per second. They have been doing so since the year 2000, and the problem is accelerating. Those are just some of the findings of a huge international study involving 35 research teams. In Perspective, we spoke to Michael Zemp, director of the World Glacier Monitoring Service.