New York Times: The Brookings Institution has compiled what it describes as one of the most comprehensive and up-to-date analyses of the US’s enigmatic green economy. For its report “Sizing the Clean Economy,” the institution collected data from every county and major metropolitan area in the US from 2003 to 2010. One point the report makes, writes Joanna Foster for the New York Times, is that although green initiatives are driving growth and innovation, market and policy challenges—such as financing shortfalls, inadequate support for innovation, and policy gaps that undercut market demand—are preventing those initiatives from reaching their full potential.