conserve

Conserve is a way of using materials carefully.  It is used to avoid using materials in a wasteful way.  


cullet

A cullet is a tiny, grain-sized particles of glass. It is used for turning glass into new glass.  


recycle

To recycle is a way of changing materials so they can be used again. It is used for conserving land from becoming landfill space. 


shards

A shard is a broken pieces of glass. It is used for changing glass so it can be used again as new glass.