Several weeks ago I built a Lego house for a school project that was called "Sharing the Planet". It is supposed to be a model, not to the scale of minifigures, but demonstrating the concept of an Energy Saving House. The solar panels on the roof of my model collect energy from the sun, which compared to fossil fuels, isn't harming the environment. The panels can actually swivel, to maximize their energy yield by following the sun around the sky.
