"Expedition Antarctica" preview

Thirty-two years ago, Robert Swan became the first man to walk to both the North and South Poles. In 2017, he decided to trek to the South Pole once again -- this time with his son Barney by his side, and with the unprecedented extra challenge of making the journey using solely renewable energy. See how their story unfolds in the CBSN Originals documentary, "Expedition Antarctica: A father and son's journey to save the planet," premiering Sunday, June 24, 2018 at 8 p.m. ET.