The world's glaciers are melting at an accelerating rate, according to a new study.

A French-led team assessed the behaviour of nearly all documented ice streams in the world.

The researchers found them to have lost almost 270 billion tonnes of ice a year over the opening two decades of the 21st Century.

The meltwater produced now accounts for about a fifth of global sea-level rise.

Robert McNabb, from the universities of Ulster and Oslo, said, "Over the last 20 years, we've seen that glaciers have lost about 267 gigatonnes (Gt) per year. So, if we take that amount of water and we divide it up across the island of Ireland, that's enough to cover all of Ireland in 3m of water each year. And the total loss is accelerating. It's growing by about 48Gt/yr, per decade."

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