Main Entry - different materials and concepts would draw visitors into the space to learn about 'green' features of the ballpark as well as what you can do at home!
Changeable Graphic Walls - the info-graphic panels can be removed and replaced as the season progresses. this would also serve as a place to set up displays or vendors that might want to advertise their sustainable practices can rent the space.
Graphic Wall Example
Large format wall graphic
Landfill Section Cut - Nothing shows the harmful effects of waste than a section of landfill!