monarch in waiting. >> as a young man he had to look around for causes to support that were not political. i think we forget that back in the day, to fight for the environment, trying to save the planet, was so off-the-wall. it wasn't a political issue. >> even though he has is extremely obvious flaws there's a general sense to where he tried to make a difference in a genuine way. when he talks about some of these causes, he means what he is saying. >> climate change being the greatest threat humanity has ever faced quite literally. as far as i'm just still alive i will try to provide whatever help i can. >> reporter: his passion for the environment has driven charles for decades. >> i'm afraid i've been absent rather long time. >> he was deemed as being bonkers for talking to his plans for holistic well-being for example.