Many governments and industry organizations around the globe have turned to this concept in recent years as a means to stimulate urban and rural economic growth. As a result, a large number of cluster initiative organizations were started during the 1990s, and the trend continues. The first comprehensive study of cluster initiatives around the world was reported in the "Cluster Initiative Greenbook" published by Örjan Sölvell, Christian Ketels and Göran Lindqvist, with a foreword by Michael Porter. The report was presented at the annual meeting of The Competitiveness Institute, TCI, in Gothenburg in 2003. A follow up study in 2005 covered more than 1400 cluster initiative organizations around the globe. In 2013, a decade after the first Greenbook, The Greenbook 2.0 was launched at the TCI global conference in Kolding, Denmark.