(CNN) — When Merle Liivand first started swimming with a monofin to help with her breaststroke practice, she never could have imagined it would one day lead her to becoming a Guinness World record ...

Editor’s Note: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet initiative has ...

Challenges, chicken soup and not so friendly fish After that, Liivand decided to set up the first of what would become five world-record trash collecting monofin swims – her latest being the 30-mile ...