Given the UN are wanting a referendum on the Royal Family I don't think Prince Charles will make the shortlist for a Nobel prize
.
Given that the UN has nothing to do with the Nobel, I'm not sure that means anything.
I don't honestly believe that Charles is a good candidate for the Peace Prize. Gore was, as he framed global warming--rightly--as a human rights issue. And as we have already seen, global warming has a direct impact on human rights. Namely: food. Largely, recent climate change--apart from normal cycles in the Earth's climate--has been exacerbated by pollution from fossil fuels. Which are now becoming more expensive due to lowering production, which causes food to become more expensive due to higher fertilizer and shipping costs. We've already seen food riots happening in recent months, and it's only likely to get worse. I'm sure everyone here has been noticing the inexorable trend towards foodstuffs costing more.
So. To combat global warming means to combat fossil fuel usage, which means that you are actually fighting to keep food costs down, which contributes to peace. Happy and well-fed people with a decent standard of living are (on balance) less likely to engage in war for e.g. arable land or food. While it is true that Charles has long been a champion of both organic and locavore movements, his reach has largely been confined to the UK. Gore has been acting globally--and again, for those who missed it earlier, he has been passionate about this issue since the 80's. This is not a recent development.
And that's really what it's come down to: Gore's reach is global (and yes, I know he flies everywhere, spewing more carbon into the atmosphere. He views it as a necessary evil, and his fee for speaking includes the cost of purchasing carbon offsets. At least he doesn't use a private jet most of the time; he flies on normal sched flights), while Charles' reach is much much smaller. And the point of the prize is that it is awarded to those (generally) who have global effects, or at the very least large regional effects, not just confined to a single country. Mother Teresa would be a counterexample, of course, but her international presence brought greater understanding towards poverty in India.
Diana, IMHO, would have been somewhat more suited to receiving the Prize, but not by much.