Icebergs, broken off from the Jakobshavn Glacier (Sermeq Kujalleq), float in Disko Bay during a summer storm. Annually, the glacier drains about 6.5% of the Greenland ice sheet and is responsible for about 10% of all Greenland's icebergs. Increasing temperatures have led to greater numbers of icebergs in summertime as more blocks calve off the main flow. The glacier itself moves at a speed of about 40 metres each day and has doubled its rate of flow in the last ten years. However, in the same time the glacier's front has retreated significantly. It is thought that both of these processes are the result of climate change.