Football fans would be ranked according to success, allowing sports fans to "earn their bragging rights, " said Ron Forbes, from Microsoft's interactive entertainment division.

CNN: Microsoft tries to redefine the couch potato

In addition to Ron Baron, two other Forbes 400 members addressed the crowd: David Rubenstein of private equity giant The Carlyle Group and Kevin Plank, founder and CEO of Baltimore-based Under Armour.

FORBES: Ron Baron's Investment Conference Features Billionaires Kevin Plank And David Rubenstein, Celine Dion And Harry Connick Jr.

To get a better sense of what "clean tech" is and isn't, Forbes.com spoke with Ron Pernick, the founder of Clean Edge research firm and co-author of The Clean Tech Revolution.

FORBES: Magazine Article