Of course he is - anybody who doesn't agree with you on one issue is both an idiot and a loon. What does that then say about you that you probably agree on 95% of issues?
His Royal Highness is a conservative. The idea that climate change is a real threat that mankind has the power to do something to address is just about the only issue on which he'd disagree with the majority of people here at FreeRepublic (he'd also disagree with extreme demonising of people just because they happen to have been raised in the Islamic faith - he has no time or truck with those who use religion to justify murder, but he believes there are plenty of Moslems out there who are people of good will who just happen to have been raised in a particular faith, just as he was raised from birth in the Church of England.) But on the vast majority of issues, he's a conservative. He is pro-religion, pro-Christianity, pro-gun (by no means a universal position among British conservatives), pro-military, pro-limited government - I could go on, but is there any point? It doesn't seem to matter what somebody supports if they happen to disagree on even one or two points.
Constitutionally, and by convention, the Prince can only speak publically on issues that are either so minor Her Majesty's Government has no policy on them, or where he happens to agree with government policy. This is the reason why the Prince speaks so often on climate change - because it is just about the only point of agreement he has with Britain's current socialist government. He'd like to speak more broadly - but when you are constitutionally not permitted to have opinions that differ from the elected government of your country, that doesn't leave you much to talk about when you disagree with 95% of what they stand for.
The Prince knows what certain people think of him - he accepts that as the price he has to pay to continue to act within the constitutional conventions of the United Kingdom. He'd much rather be called a loon and an idiot than violate his oath to his nation and his Queen.
I feel fortunate that there is impediment to his friends speaking out in his defence, even when he is not permitted to do it himself.
I disagree with the Prince on climate change, and he knows it. But though I disagree with him, I'm also aware that he has spent at least one hundred times as long as I have and at least one hundred times as much effort, studying the issue before coming to his opinion. He has spoken to experts on both sides of the fence (one advantage he has over most people, is if he asks to speak to someone, he generally gets to do so). His position is honestly held based on what he considers to be the best available scientific evidence. I respect that, even if I disagree. And I will speak of him as I find him to be. Honest, sincere, dedicated, patriotic, and utterly committed to doing his duty as he sees a duty to be done.