The CleanTech Business Execution Challenge is in the process of deciding between twenty different cleantech companies. The winner of the competition will have the chance to pitch their concepts to an audience of investors. The challenge is sponsored by Vator.tv, AlwaysOn, KMPG and Matter Network.

The entrants for this competition have significant potential. The following projects are just a sample of the entries: visit the site to see the whole list.

The team behind CarbonCart noticed that while many people have reduced the carbon emissions from their own travels, few make an effort to do the same for their purchases. CarbonCart offers carbon neutral online shopping: every time you make a purchase on CarbonCart, you select an offset project to support so that the shipping it takes to get a new book of laptop to your door is entirely offset.

Serious Materials is a well-established building materials producer. The company has been manufacturing sustainable building materials since 2002. The company is working to create new materials, including their new EcoRock. EcoRock is intended to replace drywall, which requires significant energy to manufacture. EcoRock is produced with no CO2 emissions.

GreenDustries has developed a prototype for greener packaging for the fast food industry. Current food packaging uses about 13 grams of paper to protect a burger or some fries. The founders of GreenDustries, Akiva Buchberg and Gilbert Capy, invented a new type of packaging that holds up to the needs of consumers — no mess, keeps food warm and is easy to carry — while significantly reducing the amount of paper needed to about 2 grams. The secret is a method of pleating paper packaging in order to guarantee a strong package without requiring more materials.

When it comes to social networking, Techtain seems able to overcome the difficulties that have faced former eco-friendly networks. Rather than relying on members of the network to create profiles, Techtain has created an e-commerce system that uses existing connections, such as Facebook. Members list items they want and items they wish to get rid of: Techtain makes connections so that users recycle and reuse items, rather than throwing them away.

You are able to vote between the many contestants who have submitted videos about their work to the CleanTech Business Execution Challenge. Help choose which company has a chance to meet with investors, while learning more about new cleantech businesses currently in development. While these four have interesting plans, there are sixteen more who have worked equally hard to build a successful business.