I am in 8th grade and doing a poster board project on ozone pollution and i need a idea on a prop...help!!!!!!?

I also have the chocies between landfill,greenhouse effect/global warming, littering acid rain, urban sprawl, defrosting, global ice melting, smog, species extinctions, resources sustainbility, chemical runoff pollution, and carbon footprints if u think of a prop for these plese send me an answer