This report from the Brookings Institution examines the U.S. clean energy economy. It seeks to quantify the existing market, growth prospects, and methods that might spur industry developments. The clean energy sector employs more people than the fossil fuel industry. 26% of the work is in manufacturing. The report recommends government incentives for a low carbon economy. The clean energy economy is now driven by a vision of more jobs and a growing industry segment, not just environmental concerns.