To mark the new millennium, this year's Reith Lectures are delivered by five different thinkers, each eminent in a different field. At the end of the run, the Prince of Wales presents his own views on the topic in a roundtable discussion with all five lecturers. The Millennium Reith Lectures deal with one of the most pressing issues of our time - sustainable development. The second lecture, delivered from Los Angeles is by Tom Lovejoy. Tom Lovejoy is Chief Biodiversity Advisor for the World Bank and Counsellor at the Smithsonian Institution, Washington. He is a former member of the White House Science Council and UN Environment Programme, and is a specialist in environmental biology of the tropics and Latin American region. In his lecture about biodiversity, Tom Lovejoy raises issues about our treatment of creation and our status within it. He believes that biodiversity is the best single indicator of an area's long term biological and economic health.