Maybe he could just Webex.... if he’s so concerned about the environment
He is concerned about the environment - and has been since long before it became a fashionable cause. But he’s also smart enough to know that individual gestures don’t make any real difference. Trying to present his case (whether you agree with it or not) to as wide an audience as possible does make a difference. He has an almost unique ability to get people to listen to him. Where he can, he uses it. Unfortunately, he’s constitutionally limited in what he can talk about as heir to the throne, so he tends to focus on fairly fringe areas.