In the same way that knowledge was the defining difference between the growth that emerged in the latter part of the 20 Century, “Green” or growth that is derived from low carbon or environmentally sustainable business practices, products goods and services will be the defining difference in the economy in the first half of the 21st Century. Green growth will also necessitate the development of new measurements covering dimensions of quality-of-life above and beyond material well-being. Nevertheless, getting a sense of the current potential in Sydney is difficult.