Glaciers are shrinking and ocean levels are rising because of it

As climate-watchers and coastal-dwellers keep a weather eye out for signals of irreversible changes in the environment, the world’s fastest-moving glacier has already begun self-destruction.
Jakobshavn is now shedding ice nearly three times as quickly as it was 20 years ago, dumping enormous and growing quantities into the ocean. It's contributed 0.1 millimeters per year to worldwide sea-level rise — more than 3 percent of the 3 mm produced globally — for the past decade.
The glacier “has been retreating for the last 100 years,” according to Ian Joughin, senior principal engineer at the Polar Science Center, part of the University of Washington's Applied Physics Laboratory. “Retreat” means a glacier is shrinking in length, losing more ice from its face that meets the water than accumulates from higher up.
But it was only in recent decades that the retreat reached extreme levels.

http://www.globalpost.com/dispatch/news/science/global-warming/140228/global-warming-greenland-Jakobshavn-glacier-sea-level