Secretary of State John Kerry visits Antarctica (15 images)

U.S. Secretary of State John Kerry looks out at an iceberg in McMurdo Sound, Antarctica, on November 11, 2016, as he conducted a helicopter tour of U.S. research facilities around Ross Island and the Ross Sea, and visited the McMurdo Station in an effort to learn about the effects of climate change on the Continent. Photo by U.S. Department of State/UPI

U.S. Secretary of State John Kerry signs a guestbook on November 11, 2016, inside the hut in Cape Royds, Antarctica, where explorer Ernest Shackleton and 14 other men lived in 1908, as the Secretary conducted a helicopter tour of U.S. research facilities around Ross Island and the Ross Sea, and visited the McMurdo Station in an effort to learn about the effects of climate change on the Continent. Photo by U.S. Department of State/UPI

U.S. Secretary of State John Kerry walks through the zone where ice crashes into land outside Scott Base, the New Zealand research station in the Antarctic, on November 12, 2016, after touring the facility, the neighboring McMurdo Station, and other U.S. research facilities around Ross Island and the Ross Sea in an effort to learn about the effects of climate change on the Continent. Photo by U.S. Department of State/UPI

A scientist shows U.S. Secretary of State John Kerry a tracking tag affixed to Weddell seals as the Secretary toured Crary Labs at McMurdo Station in Antarctica on November 12, 2016, during a visit to U.S. research facilities around Ross Island and the Ross Sea in an effort to learn about the effects of climate change on the Continent. Photo by U.S. Department of State/UPI