Watch Greta Thunberg's journey across the Atlantic on YouTube

It's not every day you get to sail a world-famous, Nobel Prize-nominated, teen activist across the seas on your yacht.

That's exactly what Australian couple Elayna Carausu and Riley Whitelum did with their crew in December, sailing 3200 nautical miles across the Atlantic Ocean to Lisbon, Portugal with Greta Thunberg and her...