off - that's the magic word. switch off the lights whenever you leave any room. turn off the faucet while brushing your teeth. turn off the radio whne you're tired of listening and if the crap it croons doesn't sound like music anymore. or have you not heard of noise pollution?
carpool for schoolmates who live in the area would be a help to save gas. nearby school, why not walk?
you can use this daily exercise.
try using your talents in the art club, promote this positive idea to create posters, streamers or flyers dedicated to mother earth.