Australia's population, now 18.5 million, is set to rise to as many as 26 million by the year 2051. It will do this by accident - Australia has never had a population target. Do we understand the implications of this massive growth for our society and environment? Mark O'Connor explains how Australia's population and immigration debates have been stifled by political correctness and examines the moral, environmental, economic and political issues involved with the population debate.