LONDON (AFP) - Prince Charles, the heir to the British throne, admitted in an interview published Sunday that he found it "depressing" that his frequent warnings over climate change had not been heeded. The Prince of Wales added, though, that he was "delighted" that it seemed people had begun to realise that he had in fact been ringing the alarm over a serious issue and not "complete nonsense". "All I have been trying to do is remind people that we have to live and work in harmony with nature if we are to have any chance of surviving on this planet," Charles told the Sunday Telegraph in the Galapagos Islands at the end of a 10-day tour of South America. Asked if he was frustrated his warnings had not been taken seriously, he replied: "It is depressing. I am not doing this for myself but, as I keep saying, for everyone's children and our grandchildren." Charles added, however, that "if now people are beginning to realise perhaps, after all, I wasn't talking complete nonsense, then I am delighted." While in Brazil earlier this month, Charles said the current global financial crisis is "nothing" compared to the long-term impact of climate change, telling a meeting of Brazilian business leaders and officials: "We are, I fear, at a defining moment in the world's history."