Recycle

Recycle: to use again, to convert waste into material usable once again.

Recycle comes from the Latin words re (back, again) and the Greek word κύκλος (kuklos), a circle, a wheel.

Incidentally, I have a small public service side business.  I recycle old five dollar bills.  So, if you have any lying around the house, and you have been wondering what to do with them, send them my way. 

Just trying to do my part for the planet.  You are welcome, everyone.