Have you ever recycled? It's when garbage is converted into new materials.
I have, we have a recycling bin and I always put cardboard in it! What kind of materials do they make out of it?
In an ideal world, everything would be recycled! Recycled paper would become new paper, for instance.
That would be nice if everyone recycled. Has recycling been going on for a long time?
Well composting, such as reusing food for gardening, is considered recycling. So I would say it has been going on for a long time!