Thirty years ago, Robert Swan walked across this icy desert to the South Pole. He tried again, departing November 2017, this time with his twenty-three-year-old son, Barney. Their goal was to highlight the importance of sustainable energy and the imperative to curb climate change. They traveled with only renewable energy sources.

Rob, now 61, was obviously older than the first time. He trained hard to make up for his own change, though what he could not prepare for was a change in the Antarctic.