Representatives from 192 nations are converging on Copenhagen Monday for the opening day of the two-week United Nations Climate Change Conference, where the next steps are expected to be hashed out towards an international emissions agreement.

Green technology can take many forms, be it in eco-friendly light bulbs, hybrid cars, or wind turbines. It can even take the form of homework, as in the case of students competing in the Department of Energy's "Solar Decathlon."…