This is an old post, ignore the request for ideas. I just added videos for any who were curious to see it in action.
I have been asked to build a robot for display that fits the theme "Save the environment". Basically the robot must perform a function that helps the environment. This robot must be something I can build in a few weeks from available (DAGU) parts although I can order some parts like sensors that DAGU don't make.
I have a few ideas but I would like to know, what sort of job do you think a robot can do to help improve the environment?