Paul Gilding argues that we have entered a period of global ecological crisis and economic stagnation that will last for decades. This will lead to an economic and social transformation of significance in the history of humanity. Paul Gilding has been an activist and social entrepreneur for 35 years, his personal mission is to lead, inspire and motivate action globally on the transition of society and the economy to sustainability. A Sydney Ideas talk on 29 April, 2009 http://sydney.edu.au/sydney_ideas/lectures/2009/great_disruption.shtml