INTRODUCTION
Much of the introduction draws on our research and reports at Clean Edge, all available for download at www.cleanedge.com. These include Clean Tech: Profits and Potential, Clean Energy Trends 2005, Clean Energy Trends 2006, and Clean Energy Trends 2007. The latter three include important data from Nth Power and Clean Edge on VC investments in clean-energy technologies. Several key reports provided clean-tech and overall industry statistics, including the International Energy Association’s World Energy Outlook 2005 (www.iea.org/Textbase/npsum/WEO2005SUM.pdf); Renewable Energy Policy Network for the 21st Century’s (REN21’s) Global Status Report 2006, www.ren21.org/globalstatusreport/issue-Group.asp; the Global Wind Energy ...