We take a tour with David Attenborough to look at some of his favourite parts of our immensely varied continent. From Lord Howe Island, where he did his knee in, to the Gogo fossil deposits in WA and the ancient life near Shark Bay. Of a range of threats to the Great Barrier Reef, David Attenborough cites rising acidity due to dissolved carbon dioxide from the atmosphere as the big over-riding threat to the reef.
