"How do we know we're not in a cleantech bubble?"

This is a question David Chen gets asked a few times a week.

Chen is Morgan Stanley's Head of West coast Clean Technology Banking and he spoke in Menlo Park last Friday at an AlwaysOn breakfast event, a warm-up for their GoingGreen event in September.

So, how do we know we're not in a cleantech bubble?

To find out the answer to that question and more, head over to Greentech Media's Green Light blog