Nike, which will become the exclusive supplier of NFL jerseys to all of the league's 32 teams starting next month, says Reebok should be limited to selling what remains of its existing inventory of products, which would include Tebow apparel from his former team, the Denver Broncos, not new Jets products.

WSJ: Nike Sues Reebok Over Tebow Shirts

Other cleantech businesses that continue to look like good investments to venture capitalists include those producing products or software related to energy efficiency and those making improvements to existing businesses or products (making a better LED lighting system, for example).

FORBES: Second-Quarter Cleantech Investment Drops 33%, But Biofuels Make A Comeback