By Lauren Said-Moorhouse, CNNWindsor, England (CNN) — King Charles has unveiled a documentary exploring his conviction that humanity needs to understand its connection with the natural world to tackle global warming and some of the other major environmental challenges facing the planet. “Finding Harmony: A King’s Vision,” made in collaboration with his King’s Foundation charity, hits Amazon’s Prime Video platform next month. On Wednesday evening, King Charles and Queen Camilla attended the film’s glittering premiere at Windsor Castle – the first ever held at a royal residence. Archival footage of Charles during his childhood as well as of young Princes William and Harry is featured in the film. “Finding Harmony: A King’s Vision” will be available globally on Amazon Prime from February 6.