Twist and turn: Petermann Glacier

Arctic Blue Melt River, Petermann Glacier, Climate Change
Blue Melt River, Petermann Glacier, in remote northwestern Greenland, on Nares Strait. Photographed during a 2009 Greenpeace expedition to investigate the effects of climate change in the Arctic. In 2010 and 2012 Petermann calved ice islands totalling 400 square kilometres. (c) 2009 Dave Walsh

Twist and turn: Petermann Glacier, originally uploaded by Dave Walsh Photography.

Petermann Glacier, near its face, northwestern Greenland. This floating part of the glacier is 80km long, and 16km wide at it’s skinniest. The cliffs in the backgrounds are around 1000m high.

Photographed on the first leg of the Greenpeace Arctic Impacts expedition 07/07/2009. Peterman glacier is the longest floating glacier in the northern hemisphere. The floating area is 16km by 80km. A 100 square km chunk, about 5 billion tonnes of ice is about to break off – and we’re planning on being there to see it.

Chief Bottle Washer at Blather
Writer, photographer, environmental campaigner and "known troublemaker" Dave Walsh is the founder of, described both as "possibly the most arrogant and depraved website to be found either side of the majestic Shannon River", and "the nicest website circulating in Ireland". Half Irishman, half-bicycle. He lives in southern Irish city of Barcelona.