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Tricky Business

John Kemp is lowered by the ship’s crane to hook a group of floats, as part of the Beaufort Gyre Freshwater Experiment in 2005.  A 4,000-meter (13,123-foot) mooring was retrieved from the heavy ice; the buoy was one of four measuring the effects of climate change in the Beaufort Sea north of Alaska. (Photo by Chris Linder, Woods Hole Oceanographic Institution)