The trip that opened Antarctica to tourists – 60 years on, was it a mistake?

The first tourists stepped ashore at Smith Island and Melchior Islands on the Antarctic Peninsula on January 23, 1966. Since then, the White Continent has become a bucket-list item, with 80,000 visitors last year. US Travel Editor Ted Thornhill speaks with polar explorers and climate scientists to explore whether that landing 60 years ago was for better or worse