I am not sure if this is a new invention or not since most of these pieces already exist just not in combination with one another.
Bong recharger.
It is possible (so I have heard) to fit a small turbine inside of a bong so that as the exhaust is suced out by the user the turbine spins and chanrges a battery or cell phone. Not saying it is the most practical way to go green but at least it shows that creating and conserving energy can be fun and exciting.
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