The Brookings Institution released a report on green jobs earlier this month entitled Sizing the Clean Economy: A National and Regional Green Jobs Assessment. This report is based on the Brookings-Battelle Clean Economy Database, which is a collaborative effort of Brookings Metropolitan Policy PRogram and the Battelle Technology Partnership Program.
The report provides a variety of data on the size, growth, and geography of the “clean” or green economy and states that there were 2.7 milion jobs in this sector in 2010. The definition of "clean economy" used in this report is:
The clean economy is economic activity — measured in terms of establishments and the jobs associated with them — that produces goods and services with an environmental benefit or adds value to such products using skills or technologies that are uniquely applied to those products.
You can downloaded the complete report and associated data from the sidebar on this page. In addition, below is a video from the launch event of this report (more videos available here).