Since the tsunami, Phi Phi has come under greater threat from mass tourism. Dr Thon Thamrongnawasawat, an environmental activist and member of Thailand's National Reform Council, is campaigning to have Phi Phi tourist numbers capped before its natural beauty is completely destroyed. With southern Thailand attracting thousands more tourists every day, Dr Thon makes the point that the ecosystem is under threat and is fast disappearing. "Economically, a few people may be enriched, but their selfishness will come at great cost to Thailand", says Dr Thon, a marine biology lecturer at Kasetsart University and an established environmental writer.