Over the same period, green technology exports increased by 77% compared to 30% for welfare technology and -12% for manufacturing.

FORBES: Copenhagen Shows How Cities Can Become Clean Tech Leaders

Boston largely missed the boat on the boom in information technology, but hasn't missed the green boom by any measure.

FORBES: Magazine Article

In other green technology news, Casabella unveiled a stair-climbing vacuum cleaner that is powered by trash.

ENGADGET: Inhabitat's Week in Green: stair-climbing vacuum cleaner, carbon dioxide diapers and a real 3D-printed face