I support 'going Green'...however, keep in mind, "Green" product companies are also in it to MAKE MONEY. Many of these things you can MAKE so much cheaper, with what you already have in your home. The investment in time to find them is well worth it.
Weathering Erosion and Deposition Game - Each team had to weather away a piece of their Lego landform, crabwalk (erode it) to the other end of the room, and deposit it on the desk. It showed how weathering away of rock makes it smaller and smaller, erosion is when sediment gets moved from one place to another, and deposition is when sediment gets dropped off to make new landforms.