Seattle-area Internet geeks and environmental groups came together on Microsoft's Redmond campus today to brainstorm about environmentally oriented Web applications in what was billed as a "Green & Geekalicious Hackday." Here are a couple whiteboards where they wrote down some of their ideas. (Click for larger versions.)

What do you think? See anything interesting? What would you add? People at the event focused on using the Microsoft Bing application programming interface, but don't limit yourself if you chime in below.