Nowadays, sports Mega-events - with the Olympic Games leading the way – go to immense effort to showcase their environmental credentials. With that in mind, this book compares and contrasts the environmental credentials of four Olympic Host cities starting with Sydney 2000, the host of the first Green Summer Olympics, and culminating with London 2012. Setting out a comparative cross-national study that makes extensive use of perspectives offered by environmental sociology, this book showcases the scientific analytical vigour of this sociological sub-discipline. Since in most cases, the linkages between hosting the Games and the environment that are made by the general public and policy-makers are mostly in relation to the regeneration of the host city, this book engages with this type of environmental related contributions that can be made by Olympic Games hosting. Yet, inspired by the emphasis that the International Olympic Committee (IOC) gives on the environmental impact and legacy of Games in terms of the Ecological Modernization (EM) perspective, the book engages with the potential imbued by Olympic Games hosting for the EM of the host nation.