Australian Broadcasting Corporation: An American coastal geologist describes rising sea levels is going to be the first major negative impact of global warming. Described as America’s most outspoken coastal geologist Professor Orrin Pilkey assumes sea levels will rise by 2 metres by 2100. This is far beyond the predictions of the Intergovernmental Panel on Climate Change who claim levels will rise to half a metre. He says more needs to be done to prepare coastal communities from climate change …