NASA released a stunning photograph captioned Tip of the Iceberg. Captured by a French astronaut, the image shows the Upsala Glacier suffering a significant retreat as a large chunk of it break away
The Agassiz Glacier is also in Glacier park, a vast area that encompasses over 1m acres (404,685 hectares) and parts of two mountain ranges. The landscape here has been carved out by glacial action over millennia. These images record the decline of Agassiz between 1913 and 2007.
The Columbia glacier is a large tidewater glacier, flowing down the side of the Chugach mountain towards Prince William Sound in south-eastern Alaska. False-colour images, captured by Landsat satellites, show how the glacier and the surrounding landscape has changed in recent years.
Since the 1980s, the terminus â the tip of the glacier that points towards the sea â has retreated more than 20km (12 miles) to the north. In some years, the terminus retreated more than a kilometre, though the pace has been uneven.