"It's kind of the umbilical cord to earth," the actor tells CNN. "You know, if you think about the Hawaiian islands, that's the biggest mountain in the world, right? All the way up. So Mauna Kea is the most sacred. They call it the belly button, too. That's like our birth place. You can imagine that in the middle of the ocean. That's how our islands were formed. So how can that not be sacred?"