Photo: The crumbling Petermann glacier

This image from NASA’s Aqua satellite shows a 130-square-kilometre chunk of ice, about a quarter the size of the Island of Montreal, breaking away from the Petermann glacier in northwestern Greenland July 17. This is the second time in less than two years that a huge chunk of ice has broken away from the Petermann ice sheet. Climate change is believed to be a factor in the increased rate of iceberg calving off Greenland. (NASA HANDOUT IMAGE)