Hey Stu I take your point ... but it seems the hillside escarpment in one of those photos would be less than 50% "used" by climbers - the sections of hideous vegetated grey slabs would be ignored just like they are in Krabi. So even if all the "good bits" got developed, the birds etc would not be disturbed on at least half of that cliff. It's probably a similar story for the other areas because that guy wasn't exactly going to post photos of all the chossy, loose or vegetated cliffs. Obviously the exact ratio of climbable to non-climbable cliffs is not clear ... but if Tongans can generate some climbing tourism with minimal impact to the total cliff environment then maybe that'd be better than selling their souls to the logging companies to prop up their economy ... just a thought.